Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d64a5887be5b1b…

MALICIOUS

PDF

87.0 KB Created: 2021-06-29 12:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17ef90d3cf5d5247de5e8cdf2600f24d SHA-1: a511c92c728b59d9a0e2ba52916661d11e78af66 SHA-256: 50d64a5887be5b1be34c49270589662dcaad5d5d2a645019bf2ee97f76f051c5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab38aaeb5---zenusomijumiruw.pdf
    • http://metabolit-plus.ru/files/file/sakubusiliboke.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831e2b69ad---rujupa.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/754f619afc5f97b78e1c42ed8001337a/subowobajebibilobisi.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13d01cedd---salezenirapu.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087136f7d9c3---68789615514.pdf
    • https://muratay.nl/userfiles/file/woboferemom.pdf
    • http://pallenberg-busreisen.de/uploads/files/muwuridefudivixevumazopux.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090577d23e4a---22191308538.pdf
    • https://alamansyria.com/userfiles/file/rajidirapopalipulek.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef7a92fbde---zakijola.pdf
    • http://robertoantoniz.com/resources/original/file/96904263134.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5cff3765b---83122247879.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090609372941---dogewajipatipade.pdf
    • http://etcad.net/np/upfile/file/gowewavavuxumorit.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/niforupaxekazefug.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ef96d819fde76021b7210fa12d49fc68/35933777747.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f6a0ba9a851c2d717704409b9770853e/diluzofozilesidu.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d95de45f---tulozudutipi.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b381bcf0---70504907326.pdf
    • http://hrdiborice.cz/erucom1/files/files/86469037936.pdf
    • http://parkwaywest1974.com/clients/861606/File/ninuzog.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/89089216161.pdf
    • http://aexpress.lv/index/images/up/file/bukuvevumolo.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160855667ca6d4---54040931885.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=archangel+for+business+success
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13e.bin
4f018415fe763a8d3d774c676f15de0e84ffdfdc680fc87b694dde592c50d62a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 10736 bytes
font_01_sfnt_off000109d2.bin
14deefcd717be566b5ad1481a4fb1e797179a4241738fb02431d0a2e015b664b
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 17168 bytes
font_02_sfnt_off000136b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136B3 16792 bytes