Malicious PDF — malware analysis report

Static analysis result for SHA-256 484905a3be222bc5…

MALICIOUS

PDF

69.6 KB Created: 2021-06-21 16:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ddd28ca1f370db22a7627f3874e96388 SHA-1: 9d755bcfcbe276f271204ff4f63a239555aa6a8a SHA-256: 484905a3be222bc55fe1a8cef21844512b933d77452fbe0cca618b9f4ae1a2fd
196 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to compromised CMS upload storage, likely intended to host and distribute further malicious content. The presence of 'cmdl16cqr07da5h8979sp9r5/tisatorunomutofad.pdf' in the document text, alongside a URL, suggests a direct attempt to trick the user into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://bleikss.com/userfiles/file/56310718393.pdf In PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/fhgqmgqpu5ofgc044h059mu9f0/22969897286.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qdcmdl16cqr07da5h8979sp9r5/tisatorunomutofad.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/90975ce5a78217f9e4171660cd0364da/juridiladupurilelo.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2dc4484e---zirojojegedepegawu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a465591ea6e---malazufazobofasokemul.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c560852780d---supojesevoladitilokape.pdfIn PDF document text
    • http://bjallstar.com/upload/file/82269970155.pdfIn PDF document text
    • http://charivne.info/images/file/vaxenopilabar.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/tegafidiwifesafivara.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/91612857739.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8ccc0d46d8fc9471d48a766fa955df06/tadomagoriwadinixuwuref.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/petezeb.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/dodupaluzefegovijete.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/2729f83b0ba358154d9f5ebc0f52968b/buret.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56dec3413b---sunasopimisevuxonipuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=activity+1+simple+future+tensePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 5156 bytes
SHA-256: 4d430e39cb66256342c118b9f7fd05380fd53718f0d904e91f3c5d593e88e74f
font_01_sfnt_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 10556 bytes
SHA-256: 60cdc8337f3797d83fd716eeb5be294f6d37ebdede13077735336d79f8f54756

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