Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd6ec094c537c44…

MALICIOUS

PDF

71.6 KB Created: 2021-08-27 21:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bf7abe6300bc18e3255c21dbe1c6f03a SHA-1: 3930e0d6993892c065bff02650f37f2c685bcfc4 SHA-256: bfd6ec094c537c44a125f755d02742426cb80b122e16605405036846e0c036ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only facade with a clickable action, designed to direct users to external URLs. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's a crafted lure rather than legitimate content. The presence of numerous links to compromised CMS uploads and disposable hosting further supports a malicious intent, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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=intuitive+eating+morbidly+obese PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bec43493487---medumujazerepusugizup.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9de6170ff---62580956631.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9442361a1e---89612498055.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/35702668206.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/1faa80i26ipp55j6de2177mfo0/6888326476.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/4585bab884c46541bbda50cd8d871ed7/pinopijakokaxudif.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/58245626317.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/8im1ca6mh9ku0slkqulh6gri6q/benitaxefefategukilonof.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/36321473495.pdfIn PDF document text
    • http://www.polni.si/Images/files/zonen.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/34728436675.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b2e3ada86054094ffa7e1071532b71d3/kujerilonalesinapulibi.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c67405f6---kabarupeminak.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ed5bde2ac2545007edabef8871e8ea24/gujoxaworunawaxibalo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f668e897---tekonaledo.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/xalutuforapusejovolegor.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/julovokadoxukalojode.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/59455439825.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/65937960289.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/botevaxotifudiralegopi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24c85c1c08---rotufifuwizogikukenubod.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/70409303571.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/8973048522.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210821222345.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_off0000bba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA7 10960 bytes
SHA-256: 04957ba0253867cd25f9c6a2f674d58050870921fd652aac870dda37ed958c61
font_01_sfnt_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 14048 bytes
SHA-256: 501a32a8fbcb0a30f6bcac66188028fe50ab4f69506c331ee00901dcfd549d72

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