Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c09eb28f404fe6…

MALICIOUS

PDF

109.4 KB Created: 2021-09-07 21:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7793237a535f0d1f8b1471492bffa97d SHA-1: dfa7eef35b88b0727c5225776082854de28bc651 SHA-256: 41c09eb28f404fe68c69c5b43ffe397560fff802f253a8028fd1bfc9be644f87
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest the presence of embedded JavaScript and a link farm pointing to compromised hosting, likely used to host malicious content or redirect users. The document's structure and heuristic firings align with a callback phishing or tech-support scam, aiming to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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.
  • 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.
  • 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 http://beiks.info/public/file/sifikipumuv.pdf In PDF document text
    • http://berbun.com/user_img/file/jokixolonirop.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/14nbvb7f3l064vbfrsbk23t4nf/ninexumeto.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160740340d3214---20427266429.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2673b113d6---goluvuworaxajunaxalofof.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/17604406054.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/lelavivekawomovibo.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/2bc9c66c8b74bca8b61b8808566634f1/japojafudufufiforoliv.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/8784602481.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83376c06b9---fisatas.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/96885910745.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/2a5a3111c3531e94fa5f1a1fa25f7174/bijibudu.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/nixejuwo.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/791afd1f5a0b78243d2d2621ff8d77b2/4714600945.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7b19adc95559187ec9e1a71839ffb455/zajenavemid.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/32183292962.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d3d61a747---xiretojipazuferunubaguxu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f3bf143b93a8402093d4eb3315b1321b/90688816461.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/84925224610.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6613ec086---18688589518.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/70660703595.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/kezuzonexurekev.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/12302409758.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/vekegofozigowurulazujodus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fabrication+of+pn+junction+pdfPDF link annotation
    • 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_off00014307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14307 10616 bytes
SHA-256: 7df7480a404b5abceaf2770a3355e31e7349eeaa775c69f3ba5462102104547a
font_01_sfnt_off00015b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B21 20032 bytes
SHA-256: ce22892916a9327dc651906a2de89e7c4a0cd1489d5e872eb1e6ea72e38c56f0
font_02_sfnt_off00018fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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