Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a91edf62bb7357f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 15:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6aa8c7982f48acca629097af21fec780 SHA-1: 3ad2db1b50f1d4cab11a30a63508ea4d668b593e SHA-256: 0a91edf62bb7357f684dc1002d3121f92718793bf639ac0b69b5672e011ad82f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://drafthe.ru/uplcv?utm_term=english+speech+topics+pdf PDF link annotation
    • http://northmarking.com/userfiles/files/batevenatoribonakebexovi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f95eb84c831---56425828308.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/k25mll4cvo2ve2ih86op526hqt/pinejexoxiwakozuziv.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9d0f2394554ae42aeec5ed4d1135bc02/83132134367.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/afe01e735cfb886a0e920ec3fe4b2d8a/vodegadozamafa.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/11726198250.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2f352f0ff---pezamaxiseraresosusalel.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/56327462088.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/jufevamebuka.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e8400706---45184106577.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/808a5070c29eeba1b76447d8eafdbc70/92153462914.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tijapewere.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4f46f544f0fe0d13189c328242b87025/18372700746.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/lopudutazavixa.pdfIn PDF document text
    • https://go2germany.ru/files/file/zikobopavatabiv.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/gonaxamuxe.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/41482909888.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfad12d66---gabiwiderep.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/mugazilovizukufalulewil.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/29888c522d80fbdb7a557888a1088402/firatuviluxus.pdfIn PDF document text
    • http://jucal.es/images/file/fufebogusazujif.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/97224657004.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e4b420fe---85077909329.pdfIn PDF document text
    • https://marigabung.com/contents//files/sofesunowet.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/rivijefisujapepuj.pdfIn PDF document text
    • 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_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 17576 bytes
SHA-256: 7fed7583c8e3d1eca95bf43f68b2ced3c3e02357bb30f1ddba0f70b6987dd740
font_01_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 10620 bytes
SHA-256: 3a3123c62a737699609c28432dbcea11fe003cdf634d5cebec0050a578a4df9c
font_02_sfnt_off00012747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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