Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c22a3416ab94d8e…

MALICIOUS

PDF

81.1 KB Created: 2021-06-26 01:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e5c8db7a8701fb5f01b9e2816b3a1588 SHA-1: 8be7d44163f67226cc92c2dc18dcf6e603fb0dd1 SHA-256: 8c22a3416ab94d8efad9ffc6cd8da6ed14155f7005608c5c157870a84da182be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are hosted on disposable or compromised CMS upload storage, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://superchills.com/userfiles/file/pepedifevakewugez.pdf In PDF document text
    • https://cvsc.co/userfiles/file/37917211677.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/tinunadukolegeramax.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/637795d54bf26b7dfaa177f8521a0bd9/jatesosabimapajagaposuwo.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/hvvkqnoj20p4m43j2h32a6l70p/4351819403.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/m4vpptdsk9fvsdosdrr50nmho3/begefu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/98395517960.pdfIn PDF document text
    • https://drsaman.com/files/23552538013.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e5cb528df---75036417711.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/vazevevotigugux.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9524e173cd---90514820333.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978fb443978---setet.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc61df280---zuromij.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc4362c0d---kebufepexed.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/30477730050.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/sadazupe.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/dirazimirize.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/39899236676.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083526c0edc9---45328999543.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/58303893916.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/ce1b98424981c839a66b716116ea7dd1/savilixabeduwin.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/guwege.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/xotulebuvipimuzadi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7aa642e2c---witaxarowosogidir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=calculate+mean+deviation+from+mean+for+the+following+dataPDF 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_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 11040 bytes
SHA-256: 77dbbf808ba91002e7b12d6eb6081c127e7d09e9ae739fd59f296e6235934e24
font_02_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 17716 bytes
SHA-256: 47c5b3793223dafff28710f3d448a1d73c65ca8f9ca73a08efa6f4ba2add89f8

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