Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3a94fb8727add9…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 08:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6bbf8fb166b92d4465476ba2f6bf1987 SHA-1: 5890e49afb7e3ec474a2df3d6eacd89ebea728ab SHA-256: ad3a94fb8727add9c783b7442d62365750cd40548ec8e5ed4e7957eaa29f9378
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm or hosted on compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable binary data, so the analysis relies on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=calculus+1+-+differentiation+and+integration+pdf PDF link annotation
    • https://thai-airpark.com/ckfinder/userfiles/files/88820443956.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/tetazowuniraj.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/potawavexipe.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/t2bc3li44ak4bu7gd9j1t9kjs5/gulirisagategukutafumid.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/7548907089.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/20102543979.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/mavok.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/aaa3s0vcamfjv6g5ci70la99qi/xenuj.pdfIn PDF document text
    • http://koma-brzeg.pl/userfiles/file/41392653062.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/94878742835.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/71729377144.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/76501435718.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7e5099e457d0c192b649ffa65ed52d61/salesemufola.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/jibelewi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160877d64f27c6---bozabeximedabemojazigusuw.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/subewuvemere.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/58133081959.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c3fda6b40---6025800241.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4c1dc2bfa---karumasikonujajizifojami.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124eedf3cda5---69930894463.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16117c3fa42f71---fekos.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8945f59b35---36923037016.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082558cc8287---gupikavejon.pdfIn PDF document text
    • http://imbirimbir.ru/files/32051839457.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_off0000d5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 11012 bytes
SHA-256: 4e790f9d38c1008aace40f277e0798a03342f1a005e2a5650b0256c10dc4e82d
font_01_sfnt_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 16452 bytes
SHA-256: 33027a7a3bd5177ed9dd54c7036a2048c0c4b6bdcb26ce0c68c038492ff2d3e0
font_02_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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