Malicious PDF — malware analysis report

Static analysis result for SHA-256 676ba00b0e89326a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 15:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3545215556ce51e48c5bf07539244d5b SHA-1: 52da1ca388d14bc6c01c02f704b406a8b535649f SHA-256: 676ba00b0e89326a98560b7b874990e1be72e27d1a2b20d34f3dfac779acd4d5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content through these links.

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://anhbanglaw.com/userfiles/file/lupizepamalejotopib.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/64ca2c882fdb1770b8a89bd04bacc277/31526845491.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075814645102---19798237687.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/95986298427.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/13975830588.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d9d4ba1be---lunekuwow.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/rabodesal.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091da612137a---fuseketedemijafita.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c373777385---vomobe.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0dc14c934ee97399fdef616e8ccf8253/musozugaras.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ec44c207a9a---36639736928.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/vudaboviv.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/17865432973.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/2beccd447d2efa673d55788048d047ad/kenoxafifoxotabumemavo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/55b94f258d80edb73cfba73a81bb54ef/vuzarit.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/fajinitege.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607673c905356---xavabovatozizixiberufili.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dafa05315ee---11641561702.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/39952410806.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/68172576245.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/bataxije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=kidde+smoke+detector+p12040+manualPDF 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_off0000c713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF25 16520 bytes
SHA-256: d450ed56693c6885e9a378133f26c02e6029c2c03aa362443ec77f154fbb9a8a
font_02_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 11232 bytes
SHA-256: 5724ae32a186d9af8938a00100ac9cb3294ea5ce734d007fe7a66e02cd25c56e

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