Malicious PDF — malware analysis report

Static analysis result for SHA-256 1886391186f3fd06…

MALICIOUS

PDF

89.1 KB Created: 2021-08-05 07:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 152ec10dcae44a18fbe57742bfcca5ed SHA-1: e817be93153291870ea9965a40c7af872db473c7 SHA-256: 1886391186f3fd06fd1c5e0e745385c460023123473694d37ab03c7964250db4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be part of link farms hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall structure strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=why+does+my+grandfather+clock+stop+running PDF link annotation
    • http://redeyeldn.com/userfiles/file/15941010011.pdfIn PDF document text
    • http://orlickachata.cz/files/files/88958853164.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/o3di9vdhpc1klqha7ls1s9833c/vabidagogi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c732126b9a---dadosikemifeje.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/88702729606.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f115f29f4e---91500454630.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/2c0dc76d23d58926b9d512e6ff6d914b/furorasakafuxeb.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd9rfqp7p1knc28s90j169q9qd/32782670898.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759563d1d83---motesizolexujunatedanofup.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/448f360ebeca79a40ce4fe5290a4bb64/jexapaxuk.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ea2f91de7---zukatuporofaz.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/25386458511.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/89221235882.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/13111236779.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/vubezipozoxabodoxuduz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe590bc38---zusivomugapotera.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/dosubat.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/13930127290.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/n9tunudquk2gqholsprbp1mit6/30998776743.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/bccd458eb56679ed9d1aead024c53b7d/dufip.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/37962342912.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c40b80c46c999c0fb4e30c2f26b1cdeb/kebuzipopanaxaxojibijulod.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a56cbf03842f9769ee09768e63273f98/45287151072.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/kasifolinuzowobaxevitera.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/62107317239.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_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 17304 bytes
SHA-256: 8b4ef0b960ee4008000385681fa64a70d23b567ad728be51981acd52bd4c7080
font_01_sfnt_off000125a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBD 11368 bytes
SHA-256: ccfb285b504ef313d3f3981f717aab1cae01554feccd63f7798d49aa8d4e8241

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