Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43b416db4a799e3…

MALICIOUS

PDF

74.0 KB Created: 2021-09-06 19:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45e96db65d2d7d309d010fff04432212 SHA-1: 6d6dd0a174759caa86aab5fbcd54f0ac92e4bcb2 SHA-256: d43b416db4a799e39d46aed8f592bcbd22308eb71a09284d8a96796b73a4d484
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised CMS platforms or disposable domains. The presence of urgency language suggests a phishing or scam attempt designed to lure users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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://discovercefalu.it/_data/images/file/38108819854.pdf In PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/94596079972.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/86167446765.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/motixifewiwazuxiz.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/sopizeniv.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/23f70ef6c052da7f7da6aa94480e5ded/63567193090.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613344402d4be---xukapivetizijes.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66a01ae9d---73360645362.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/buvumagifodef.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f130860a263---zekazej.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/45080099135.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/23314380083.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/pozivixuwelotepirujaz.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/6621016200.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/sepewulaler.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/toxat.pdfIn PDF document text
    • http://yongqingtech.com/d/files/15053496966.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/58335791305.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/4b0072617b54ba7a1897eb9ebd90cb1c/sinugarigemesigomitari.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/31426858622.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/dapipujamaji.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/tosawivitogenige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=spill+kit+sign+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_off0000bdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF6 10324 bytes
SHA-256: 25f034935b2806636419f05ea44a004fa732d84f97e90fe9334294f4137c883a
font_01_sfnt_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 17628 bytes
SHA-256: ea7473f78ccbc4646ed3e49bc41e64302520ea4c27c34397a44e62b45abdea8b
font_02_sfnt_off0001027c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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