Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2482e391f5463d5…

MALICIOUS

PDF

94.4 KB Created: 2021-09-08 05:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 78658253d8e54803bf4eb857c441f50a SHA-1: 3c67efe0795294b4a6686fd0b2b73c2d38be72e7 SHA-256: f2482e391f5463d5acf6387c5bb1a3e83211dcb3f36c39b92d5b0123646752f0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dnm.tw/uploads/files/202108240750115473.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3a4d8fb1---satuwipixakofamafeloz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2b2a15a1eabefb6dacefbbfcf7f1d2f0/75648938278.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/63942511258.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/88190636632.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/45598632566.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/mutoparozelelut.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609849a48a562---77556488772.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160720211f2f9e---50117770478.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/xogetesamamufedoz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2cd2fed3062a378581c15c8a04effb0d/zopolufa.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/54336178525.pdfIn PDF document text
    • http://zjlytl.com/images/upload/File/58705138786.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/79b77f0004f9204115495aff18e80bee/bejedubomaziv.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/67586560535.pdfIn PDF document text
    • http://compsult.net/userfiles/file/momodesibo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5a1544b0---30291953702.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cf748f0c9---56173884201.pdfIn PDF document text
    • http://starsunited.at/upload/files/4979779264.pdfIn PDF document text
    • http://scantech3d.com/files/1428277681.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/29314234737.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/52525659820.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5tjcarqa2e60s9qv8lkvt37gb4/fosigalunifalelugo.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/24348284164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dell+emc+nx3240+manualPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 18852 bytes
SHA-256: 9d7803d4112cc253c60d1bdd5e2b70f88ccfbf3011f75083b723bd874a5027b7
font_01_sfnt_off00013c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0D 10508 bytes
SHA-256: b29b3f1c9c32c9a271dfc2381b13415c1df06eb024fee6d7cb62b06d39fc6531
font_02_sfnt_off0001541b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1541B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1