Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f2b7a025364e56…

MALICIOUS

PDF

90.7 KB Created: 2021-07-21 15:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8b5439ec48959fbd05312241afe4aea3 SHA-1: 03c7e06ea7328b137a734eaba676b5bdf0dbdab9 SHA-256: 33f2b7a025364e56acd1fc874eddad0c7c4dab537dd0d5bac836f91272f16cf8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, with a high heuristic score for compromised CMS uploads and link farms. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious destinations. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f682dc345d7---92704229488.pdf In PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/97381146097.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/11981404626.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c961a0f3988---rumababuribu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9571de6876---66224681673.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/90991915475.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/tolikiwevunijip.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/6fcb5f6ce2610fda2c3260223cf8ff29/xejasijenida.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/87126608282.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/fodiwibubelan.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/f21fab02bd3716c43a5d7b84402fd891/1299595280.pdfIn PDF document text
    • https://beaszemin.com/files/digadikemuduze.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071af36ae17d---sadevinilus.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/84594170015.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/50763246850.pdfIn PDF document text
    • https://dietacud.eu/upload/file/xogaz.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f0bb4cc48---sapalerilowuvi.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/xadisezudosedatu.pdfIn PDF document text
    • http://benetalent.com/upload/files/77005055446.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/18168762847.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71f3ec533---jaxulilakelutigakorulime.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/96148458577.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/79448207915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=household+object+riddles+for+adultsPDF 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_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 10832 bytes
SHA-256: 29e4db89c1ff12cc95ea23ae862c03c735df48327697b5f35dddfbfd4432eb4d
font_02_sfnt_off00012dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 18732 bytes
SHA-256: 4677afdb40438e9c0b1ed9d8730436ef7e214a541c49a400d92f9fbeac3d7514

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