Malicious PDF — malware analysis report

Static analysis result for SHA-256 888a6e868d5da53e…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 23:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a47e465f3c0c229a0d8c5b5bfec5919d SHA-1: 71f6b1d34104b6368a52ed743bbbe219eefd9826 SHA-256: 888a6e868d5da53ea0b103da199d508cede87b32bf86458cc7bba469bfa703ad
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including links to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads or exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://huntic.ru/uplcv?utm_term=r+shankar+principles+of+quantum+mechanics+pdf PDF link annotation
    • http://productinfo.in/konadnew/userfiles/file/70212709766.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db008134d6---xolozoralumetexetulo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e052c4cdbea17bdc4ba188477ad37733/10207054087.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/32102160679.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/21109342031.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021912459556743.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/65809339034.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///sepotez.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/37462770169.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/pewuzopasudi.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/kesuginutisilelul.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161348a7e300a0---91195149302.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f509235ecf---lemagakolegewoxutar.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/vojugeselujabelekafi.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/xovovenabuxadipa.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/15208249913.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/lazilunijoj.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/peu2vtk7pepi17d2lmh5r80t50/nalozovapinuwazekir.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/73783028767.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/tosasalorotuxebun.pdfIn PDF document text
    • http://saimiri.name/upload/file/27513023935.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_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 11268 bytes
SHA-256: 39ecb912a64635e3250e5ca6e9262703c7406a411dce1ecabde9ea97d8e3fbde
font_02_sfnt_off00011472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 18732 bytes
SHA-256: c8acf50e593e3f20b1c6580665ca5088cbc71a188b6a4ca553c6d640f2e3808a

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