Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d043cae2d68856…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 03:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02fb34961d50a4a42c9131e6a7ed4381 SHA-1: 11e15c2291b894b49a71adb86685451b6e6ed169 SHA-256: 22d043cae2d688560221e8ba344f58cebb9b3b260605edb1ce7f02587b6b549c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa957d0d863---lebezug.pdf In PDF document text
    • https://casabresciani.it/uploads/file/10602618857.pdfIn PDF document text
    • https://svltv.in/userfiles/files/40659234269.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8cb4f03af---wenemuganefimalidalovinu.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/32175433126.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/setaloxakosor.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/94628435179.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/fe1092647f5d70d207018b646ecc2ed0/sigino.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/45214216541.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/25775939326.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b0d848b65bd6251598059cf41e488e7f/86019078807.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086f0e56b027---83487396599.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/xofalusobibusevevonus.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/fisusalukasa.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/b1tt3kd4ukvs8i5knp300cqkip/xajagetasorunaminikewokir.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100567b8d5e9---jedaligi.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/91262158242.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4677b2f82e---28005275337.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/75135622490.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/85376808972.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7877968bce85bb3863d58f3e5f7b3b0f/xixawozejab.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a7fda9fee---ziwopurozewuk.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/zekiresuxumivi.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/80067022607.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/26141470133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=instrument+air+compressor+atlas+copco+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_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 10588 bytes
SHA-256: f33dca9d20ccb2233c2b7f34f53e71228fe0ade12d37c78465b4eb228f91c75f
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 17320 bytes
SHA-256: 2faca384b2ab8e285c44fa672e77c35133afe72e0bb0a29aae5884b29547d324
font_02_sfnt_off00012faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1