Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c67a00363b2d3fb…

MALICIOUS

PDF

83.9 KB Created: 2021-06-30 20:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bcc3275a49070882e540bef2a4ca09c2 SHA-1: b6dd3615625e8f1df472f6c63d5aef1321ee6a1d SHA-256: 8c67a00363b2d3fb2303ad2b3c076f4400d821f4b8b0a81becf0853af94b67f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160858698e605f---62767655195.pdf In PDF document text
    • https://dcoderesearch.com/uploads/bilaradoxovekamuvakedoki.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qg0iflbh848tqas4foahtlmcq6/nutifokolafoletububuzojeg.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/rejopufawinuzadidob.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/dawogerogalipisibis.pdfIn PDF document text
    • http://somogroup.vn/ckfinder/userfiles/files/59211453635.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/cdcise2f8evccnr6bj174v8mnu/lorigobobesagatubitatavi.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/276af19113ac1eb73cfcfb9c5fb74bd4/biwomabodinigixexosaru.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/aa36e1e26b565ee250d1a6bfdd5b890f/vowurevugagivux.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/bibed.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/duvarobirogi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e58c61e3fac50d58c5561d766db5aa13/20586033460.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a2907c8d---21710107524.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72ed608e1---71397625923.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/a91318307a8ebff45fbdabdd45e1fba5/70154369615.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/39417754304.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160949fb6ad972---nedigosesuzagepojeponi.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1d1pc0eo2o7jrleili669h3s81/25697666301.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/78962385871.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ncvkv47emdhad6tsbmlcodqil3/39048573148.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c100179ad4---xofuwejowuzaduvutij.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/62409443346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=section+54+of+mine+health+and+safety+actPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 11040 bytes
SHA-256: 0bd4f926eac07c1e71f8de154be43a45e08c02b0244e8b2a02cfda20d76c53cf
font_01_sfnt_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 16656 bytes
SHA-256: 5b7894753d56b7b6a14c89291fabdc472012e9c05b5fd838cf7196928d1e09cf

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