Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abf1955241662d5…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 06:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e359de142240d63f74da84f7dabe5ec3 SHA-1: da920cfe57cb3ef4138e21e97907bd9787c13b4a SHA-256: 6abf1955241662d502086400a74499468028a1027308da6866a6b13dc434c1d6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous PDF links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=i+preferred+meaning PDF link annotation
    • http://joyerialaplaza.com/ckfinder/userfiles/files/75430969596.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/48018725428.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210905140713.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/mufeveveluraduzozop.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133db6df3768---tijupowezikosokomegamil.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/72243788086.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/57317165177.pdfIn PDF document text
    • http://airfa.it/userfiles/file/lavosidazekogajo.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/kawusedizep.pdfIn PDF document text
    • http://htwy.com/upload/file/71614523352.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7bf7f510368a2c7eaefb5cac11c76005/kikuduxadazokapibi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8acc1b1f1---81532651615.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/noxazawofuteruvil.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/92560493407.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/90746629343.pdfIn PDF document text
    • http://ukrfirework.com/images/file/fevigutukor.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910035904920286.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/5376042721.pdfIn PDF document text
    • https://ptogel2.com/contents/files/suzopapaxexarosadixidubu.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/vuviluworenuwaxu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140ee1e2daef---nizazobujut.pdfIn PDF document text
    • http://rinsacars.com/files/others/29122397512.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/69998819851.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/kogolonobalatomibi.pdfIn PDF document text
    • 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_off0000b307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 10360 bytes
SHA-256: c8d253ee65e261d110f49b576643de03ab865ba8ad225516463771d363f92b71
font_02_sfnt_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 16920 bytes
SHA-256: 0c087c0be3271fd23fcb1b04294b7c9e7f4eb0134a6282e66edcfe8a386f2bfb

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