Malicious PDF — malware analysis report

Static analysis result for SHA-256 437024ff4fe2e42a…

MALICIOUS

PDF

102.5 KB Created: 2021-07-22 07:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 352142e1e14584ccc6a30178ea7032da SHA-1: 77490b790ea13e3924a54955501d7d440ec6aea4 SHA-256: 437024ff4fe2e42a0f2003ac77bf8c923013bdadfc3e1de3f2e04944d53442ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, likely intended to redirect users to malicious content or phishing pages. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam pretext, further indicating a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

Heuristics 7

  • 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) or Microsoft license-boilerplate 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://ladangmimpi2.com/contents//files/babozodozagulurix.pdf In PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/7orll1h3s4caniscvrpeh9fvg7/fojigak.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44d9507145---43729827268.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4de8c83bcb---97410246665.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/25d03ecb4cac40d7028b57189f62da4b/dojisanawa.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/dorazugejidejemibopexib.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/befitu.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160800c0938a6c---32890691702.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/60716561540.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a3188a50a3e00c6ce4b94de2bed88219/diligag.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/xegep.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/16ea48b2c72a577eb60beab6282e790e/6061218566.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/53096201209.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ec93196d6---zadogojifer.pdfIn PDF document text
    • https://brod-plovdiv.com/images/68492257854.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/4173279947.pdfIn PDF document text
    • http://nature-revive.org/files/file/77905980653.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/f6c60e9ada25a9db9310af7fe6e4c952/zelalofigenar.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/bopabuzez.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/52220018731.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/bularifena.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/64336499862.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa29340789a---91657459276.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609220a1eb11c---domidusetawasebenaxan.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/witanidemepexen.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/11504838499.pdfIn PDF document text
    • https://activepymes.com/pub/file/fipafupotego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=paragraph+with+repeated+wordsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F06 17400 bytes
SHA-256: 31de572ab49e177e3605ff5e29851f279d83c85348ea7c960d065511f27e2955
font_02_sfnt_off00015c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C32 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_03_sfnt_off0001722c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1722C 10608 bytes
SHA-256: 62fa76d5ffa655d2397528d25cba80878b9887572d82f29c72eb77b57ce4438b

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