Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff2625110f0e4cc…

MALICIOUS

PDF

80.5 KB Created: 2021-07-14 04:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de3514ceb1528ba766ee1b468906deae SHA-1: d99415f91164b9fef5dc2d7a1ee7fc640b100ab8 SHA-256: 4ff2625110f0e4cc779771c5e81d9b5e97fedb19b3c17b167434450834b456d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://allytemp.ru/uplcv?utm_term=ministry+of+defence PDF link annotation
    • http://medicaldistri.com/ckfinder_files/files/kenajatidurufodutegi.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/212615879160e8049257dd7.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f61b8634c---vabiribufotagok.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/94139209552.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d050e149ff7a255b043e61b72eeec3bf/lepilaxorix.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/nepuvevewew.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/54195753621.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe60d436b1---nemosirawumamojunebejinix.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/66536958772.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00a79cde9---65512771739.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/18618930071.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/53800117397.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/okbilds7ckf11moj4c45q245dh/rakifuzoxevulolozetukid.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210706231338.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5gk0pi0uu4oqgp6scp31d1n8ln/67886013517.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b36558c3e99---jigopo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160925e591af17---nuninovive.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/8705a3313431c7717e5948253d1c8c78/70061015019.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b9f8f6ce13a08da4e58332f2e868166d/tezanuguradimizi.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/06c6f6d7b94b70d00b13f3625dc077c7/sawona.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/vurarisa.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/rupexa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f75e943422---92932552071.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ba03d2966318918e99f33a3c6eeacbdd/vijarenasi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2E 9052 bytes
SHA-256: 2265d5419eeb0a445d95abac9b3e3e9d3529b4807245af99b362257802b02eb0
font_01_sfnt_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 16148 bytes
SHA-256: 3473009351c64a0baab41a61ea1b006afeeacedcd4415496b0fc728cfd6c0920
font_02_sfnt_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 10368 bytes
SHA-256: c19ebc80f14eec21d6da1a40f8ae2fa9e3ba3019573d20021cca8b62f901c63d
font_03_sfnt_off00011c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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