Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8cbfe031fa0d36…

MALICIOUS

PDF

74.9 KB Created: 2021-08-28 05:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3778b89533ff2940d4e1379cfd78ce31 SHA-1: 4ba01bd92702c5ac4876dfc25e1b25dd9f5b8231 SHA-256: bc8cbfe031fa0d363379c4f78ee84153232029d268f5f06b38534d9a2c5c2c91
156 Risk Score

Malware Insights

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

The file is a PDF document detected by ClamAV as 'Pdf.Phishing.Trojan'. Static analysis revealed numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, forming a link farm. The ML classifier also flagged this PDF with high confidence, indicating malicious intent. The primary attack pattern involves luring users through these links, likely to phishing pages or for further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/todakaxugatuvowepo.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b54b6bf8---90674912233.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/tedokanutataxidixovigelu.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dipijuvoragujom.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/wetafosapitawef.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d7821ce295ef561bc5f0e6255f8fdd37/pibubidigaporavijapejuj.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc68784559---mabodefewenivuralokiga.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d474cf36eb---1278796767.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4f07fae4cd6822f46e369bf8e2f151cb/fupenajosinowakejafe.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/nudilesoxebuwevusu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086be91db971---rasugigumelojoparaze.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160727c1c39a1d---wataradomazuxilox.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/dubagizanetafujikezone.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/felexuguzabepowel.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e2a14e503cc9b7da5e18e18e32932554/rizikanageje.pdfIn PDF document text
    • http://learningkey.org/userfiles/lajaworojezukidemukituvag.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/11046124885.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609105981c89b---90554829552.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/q3k1vu2d82reiehetk5bjo85pg/fifetokoladimosemejonedok.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/dedas.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/29538655008.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/62198587493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dow+this+morningPDF 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_off0000c2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B1 17132 bytes
SHA-256: 303007fba3266b2e7b22dca9ca7dcb88c749ba078bd52f943c1ebf4d4b5d5b32
font_01_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 10300 bytes
SHA-256: dc0d15bdc34883a5862e02569ebdef2423f1e64617e51cdd25652e9f43992929

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