Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ff2dc1f564cf4a…

MALICIOUS

PDF

81.9 KB Created: 2021-06-26 15:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3b6682ffebb9ec017a922b9428376813 SHA-1: f79f85c0101a2f64f17758c0fe3e0ba70af74fb1 SHA-256: 35ff2dc1f564cf4a5955456b7781cf851942f935aea18d5306a7960b315f3485
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the structure and URL distribution strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=mannose+in+food PDF link annotation
    • http://burelomdo.com/ckfinder/userfiles/files/79663064096.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160716ba499192---74038456925.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/g6l7uhqs8ceiqv8lnq1cb8ta91/37806964326.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/41611637293.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f094c541a6210ea918c13072b7dd35bb/zafatipisewalozirizo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b078ca939---mezebagilivalusoliki.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/43d556fc815c72c3d40bde25d43e4610/89655090629.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/13888551630.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/18363747160.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160711cb105dc4---90245313674.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/tizapukipezikiruf.pdfIn PDF document text
    • http://flexicourse.cz/res/file/tezilufulogiradi.pdfIn PDF document text
    • http://nakatka.com/files/file/480415860.pdfIn PDF document text
    • http://firegallery.ru/img/upload/74802032027.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3bbr6051u4ti5s78v0rc7a0qa4/wulujefawinofiwufepej.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/193d2317fe1dab111af6ea14f4effd67/49061948836.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/22304492637.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b8a5a8d6e3153660a5e80e2075e9ce81/xufevijebadifij.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c4d5c321---40041677541.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bb7f628c3---baxuliruroja.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a76dbe89e434f720482d221179082e43/21007121644.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/zegevapunurakefukabi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c077c4b834e---79478748907.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

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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 17332 bytes
SHA-256: 417ef8df232403406e3f0c248fd496c97838395ba6c02e432b14dbf75fe8ddf0
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 10096 bytes
SHA-256: 57174cfe6538d52c8a151ac02de5231a4a19eb80701f62cfbf75b0fc1e58f649
font_02_sfnt_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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