Malicious PDF — malware analysis report

Static analysis result for SHA-256 288942fc855a87a4…

MALICIOUS

PDF

87.1 KB Created: 2021-08-20 17:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d61d58aae15c03ac11a067667ccc88ea SHA-1: 490b2cb77e306f716294b3fee73b4cff30686ead SHA-256: 288942fc855a87a4634fd4d77e6221a93efefb404aa57c482bcd2feecdcbae75
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The embedded URLs and the nature of the link farm suggest an attempt to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://sam-global.info/files/file/mesuzuvo.pdf In PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/81926325863.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/e2n6eqcmm05bi1egrbm6sjk040/10474473942.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/27861869213.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a410b41b5---13853837066.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/4182265027.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e703b73b8b---kexobosolozedurujofubol.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/52250823706.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d8d515b4c94179801ad33c634d8aa065/98759296590.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/4527093092.pdfIn PDF document text
    • https://taperagi.com/contents//files/zuluzova.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/935crrsfkdn7d09pekio91bel3/topama.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/bomerama.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9a88827fa---19893012599.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/99033023728.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/cbe1f67c5be947f67c3c0e507f4b346a/bodebisepij.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/82426186101.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36d8b24885---xesekefurawaximabon.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/92521622623.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051213015673499.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/vunowadufap.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4947b7beba---59904391340.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/91212558119.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/19364541651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hdmp4mania+hollywood+english+dubbed+moviesPDF 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_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 11216 bytes
SHA-256: 0a6ddccab0d13a533b8676563fc2307e4346579639ce4b6d9a044815c62addbb
font_01_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 17000 bytes
SHA-256: 2c2f0ce3544fcf1ebc13b7bab64a9fe60dbc679370b192279b23f80c1a6f18e1
font_02_sfnt_off0001358c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1