Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fc1b4fa770935d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 15:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fed9f1278927cad4c088ee0a95b27d45 SHA-1: e815a6e54303fadd978b16cfd04333715cd90739 SHA-256: 19fc1b4fa770935d3e2b3e16133ddced34e57afeef77e178f2ab8570e7cdab9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm and the detection suggests an attempt to redirect users to malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3916d97f0e---13190602411.pdf In PDF document text
    • http://laibros.com/ckeditor/userfiles/files/80867035683.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/78746337924.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ea22cd1a166de6575cc4ffd2ca817f18/56589067581.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/71593259168.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/fevulojatejusud.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/32731991845.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/59874614403.pdfIn PDF document text
    • https://promise-land.com/upload/file/36267190017.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/wimodagiwig.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16116abd2e2645---romalurevejoroxo.pdfIn PDF document text
    • https://patc.fr/imagesfile/45721533127.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/4532321278.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/zusitadakiles.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/32301316606.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/wafosove.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b28eb57dc9c---56870285377.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/34898720918.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/52643512341.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed14122f4f---rupuji.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/figom.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/liriveviwoz.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c35a996674---fobemonababetegavar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=diploma+civil+engineering+all+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 17040 bytes
SHA-256: 256293776daa1e8e19d74f9dac55d5ba7fba0c91cacee5fde74a7ac9a4aa6f95
font_01_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 11164 bytes
SHA-256: e925eb5b0f1483ed881e07588e67a6b220123b02c500a6362dd071e52026ec1f
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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