Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc13e5cb63423d5…

MALICIOUS

PDF

90.8 KB Created: 2021-09-07 09:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f027f512404d8c6f17e842dd9eace9e SHA-1: 8a86e747353d85bfd24635f28e267fe629f0ad49 SHA-256: 8fc13e5cb63423d533d7f7a02efb788522586396046e3226d921806f26200d0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF acts as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7870aacc0---funawo.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a210d894add---12277274714.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/58509755967.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sa7rls7ecj954nmqkjg7i9v923/rafug.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/7993344882.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/jipirojawuzekuv.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/25611b83f6e47f056223f31e30e8d68c/bumamemupav.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lukoze.pdfIn PDF document text
    • http://healthywithhart.com/res/file/rugusitubovikeg.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/dp9a52ehla8nnl0sqr8k4ihv66/tadopifatexunuluxirezoxe.pdfIn PDF document text
    • https://maria-galland.ru/files/file/86622530746.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a91a08819---34309478143.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/74170839950.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/ljenule1927bqirob63tqtir2i/581670609.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/zokageboxovi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e02127cf5---lasofojurojajovupodezuxa.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/watefugidoboselobifeju.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6uf0rb3m9qq4k3ckqq2lavkhj4/bogagapipeta.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eed462d147---puset.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/43596599583.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/mafulokuxidewurokakovuf.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/80433087318.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e96eaa35---76393603460.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/191dfe32b9cc35db92fc41ef5a60cae5/veziturarumigovilaloziwo.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/popavojopidit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=all+new+bengali+story+books+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 18352 bytes
SHA-256: 0856d3ce7514208723daeec4c2d19b28907d81a613d9d6a6e0dd9fba3997f0ca
font_01_sfnt_off00012b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14381 11088 bytes
SHA-256: f66ac1d09f4414fa3b5ebb37ce8dc6f49d6afb775d889399475d640f26b79c75

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