Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8fd23b8a90d939…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 18:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b9e89847f1e7348b120e493e189e546 SHA-1: a774c4e29c11b765a2427e91a9f25bc10b7df729 SHA-256: 3d8fd23b8a90d93953ae40e5f7d381d7dffc010b6a4d9ff9f7c7e31b6b4c1a9e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a payment redirection lure. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://foulardfotografando.it/file/vifeworita.pdf In PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/80180423864.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/47306598040.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/96217379521.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/guxemawaxojikimavorobusob.pdfIn PDF document text
    • http://haai.org/upload/file/92665997226.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9437b274e---vemisuzenemenad.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/wiwavavodubogow.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/61659873998.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210902221514_776292989.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/76246234959.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/77825016591.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/00cf6b65164938f3524f22105173c380/zajobatekuxiv.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/totidodiniwosufagorakogaw.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kurewox.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2af11414e---66611354468.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/wevinokovirofokewowabadu.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/21344647291.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/tebubewediruje.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4b511d6e54da1d2a902e3f9123c255e8/78076274889.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/pijaxisaxepesofazekenexo.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/25167345237.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/zubotenunapisukok.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbed80d4c9---mizakofatoropulubik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=keyboard+for+android+phones+free+downloadPDF 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_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 10828 bytes
SHA-256: 763759e8005f1698bfc8ed31da0ae8b9f45c70d31826a6df980e237e12fb8ffd
font_01_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 17148 bytes
SHA-256: 905290f0f14dd745ac92958c215d953012883270f5882b5060dd801b8fd0c7e6
font_02_sfnt_off000123b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1