Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d21f6b05c185b39…

MALICIOUS

PDF

84.5 KB Created: 2021-07-03 23:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 46bde6a8631162afd79260e71ee68ad5 SHA-1: 9737dae841c6b5f0570a9a610932efeba0750ddd SHA-256: 6d21f6b05c185b39a2c30ab4c10feaa38dd95fb57de73046ed4c8a6e7cfd2bb8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://btsmstlucia.com/atomicsteps/upload/userfiles/file/88237590565.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5fd575a0cd3439120c1219d9e1037be5/62724123586.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/895a5f5036e86f50cd7a8610b484cf4f/28901036172.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2380d5226d44b73d37c538eda74d2d25/rumusanudanejujut.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5b71857d525d327d9a2dd642ec0bdf91/34707369856.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f4181e59c---36977064545.pdfIn PDF document text
    • https://t2sc.me/userfiles/94180221093.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a4f685e12b37afa422b2ce10147cea69/xegipe.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba31b8d99---39782536359.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c54771a37eac0e10701e911824dbc4dc/kitupoxunuw.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/576b574fc7dbd863088e3f644dbf36d6/gulakepifos.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ffafde0ed---73759648405.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/pumewa.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037d500fc7---97593085723.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/3odlctkfbn7ts3koorv7mb6gn1/jomop.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/nijedoxalazelibobi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160984e132c0d7---sivatiluxisudikuromobi.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f24f1fb79caaf62001ef1267ac2001f9/nomip.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/tanukapetejufirazoge.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/98360022293.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/b53ea65add5940a6eb1c005905d21a48/41130982073.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b92d1531315---3202190713.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af2ebcb2aed---tetamozibef.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/9195461038.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adbed0a118---47877333014.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/vinok.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/34a1814e15266a23851a25321701f3df/siwofesotudaxaveguxora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=probability+word+problem+solverPDF 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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 17664 bytes
SHA-256: 1b3dd94ea351d4cff03f826a7c15d6c1d85051f5028da3113ffc1d5783f64bb4
font_02_sfnt_off00012b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B79 10856 bytes
SHA-256: 5caeea9ba4aa9d1ddea8fb358aaa7ea29555c74105571d781b70fccefc9869ff

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