Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86bed8acd6567a6…

MALICIOUS

PDF

90.4 KB Created: 2021-08-31 01:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27418ad70def28ccaba59bf3a8c31342 SHA-1: 907c770cd146e126d8b350bb069bc831d124d6c7 SHA-256: c86bed8acd6567a6d504f22a6f308fce2c90301a9d3a61744edaab81a21916f5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The presence of numerous external URIs, including one pointing to a raw IP address and others hosted on compromised CMS upload directories, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=stewart+calculus+6th+edition+solutions+manual+pdf PDF link annotation
    • https://medosojewellery.com/userfiles/files/55094717862.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072429624c17---xaxumanesipozelowuwi.pdfIn PDF document text
    • https://senhewood.com/d/files/tawosapuxom.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/40255926826.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160852f6966a2f---95940576584.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/bemuzarepopoj.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kevavajisevobi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082efe8bda65---23604531385.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/sojukekadotubiliwopaxus.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/xunigotorobalesazujirotax.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ef4ecf3b07---13480458116.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/45190537840.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9f3a5de7dc5fac8b066c09b7edfb4d23/mejewasomisusudodajosixas.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/21407074876.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/4843473681.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210608094339.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b000c470a26---98925216541.pdfIn PDF document text
    • https://baongochoa.com/upload/file/48176559088.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/671b8aa7260322a896f6d5e394fcb180/vibajus.pdfIn PDF document text
    • https://inifd.london/uploads/file/viturano.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/96904711463.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/oe1tt25p9kde8lmd7jmc29g0a3/21496091453.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd574494ff---pakijuvuxotuni.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_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 23500 bytes
SHA-256: 0f63b544036f4af2d7ae6511983a0db38e7404234bfaea05e259f5bcf39e8d4b
font_01_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD5 11312 bytes
SHA-256: a841c58e4b6a3fa57bddc17b671117aebf6ca3b96c792b4aa6274e5d852eb822

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