Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f1bdf46326b27d…

MALICIOUS

PDF

78.8 KB Created: 2021-08-21 15:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c825b25c06a92d8f542fa46f8e5e08ea SHA-1: e22d1e2798533e75bc715d34939e0cc61d53a99b SHA-256: b8f1bdf46326b27dc144119ff7ad87bf3cfeb42ac551d0064a62535b365aa293
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and credential harvesting. The embedded JavaScript stream likely attempts to redirect the user to malicious URLs, such as the one found pointing to 'queure.ru', which is associated with Walmart money card balance checks. The document's structure and heuristics suggest it's part of a link farm designed to obscure the true destination and potentially harvest MFA codes or facilitate callback scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=walmart+money+card+text+to+check+balance PDF link annotation
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1a4819baab3e03fa61a78603f6754d7e/41979438025.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1p6v91n3a1pttir7uarnnd0l1/58625167885.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5kmkpiq1i9fsqee1v3c1bcp950/74698827432.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c6339073091347d36604edb1a50c6e01/32416830592.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a7e9bc98907eb094d51ce3425d14441f/55637681531.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052500471719.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/18e064e51e8ba5f763671f0805c5fcf0/jodogaruziro.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/goromulijo.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/31398723056.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609410b3d522e---pagiziropij.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/7920039170.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72684057969.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c3a574987---956254413.pdfIn PDF document text
    • https://vitanov.rs//files/11886433727.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1ce7498f61ce96a01c1f70b90377f986/55796356925.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9fea35634---zotasejij.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/7d38d1df7bae566a2e8ed300255fbf67/93823479545.pdfIn PDF document text
    • https://sainaudit.mn/File/45545626247.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/65476951549.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210626172311341373lhfvug.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23212848808.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/kuxuredemisopejimujago.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/mumexokofujukezurudemop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 10816 bytes
SHA-256: 235fcc5f7ec8df58d185e754afe7360899e025f6f432092e87466b7b739f86d6
font_01_sfnt_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 16812 bytes
SHA-256: 6ef30e5c173a9a29575642c1e5ec14fa956fed6aaf9261a96e72dc3629b2a031

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