Malicious PDF — malware analysis report

Static analysis result for SHA-256 2489fcd86b9e994e…

MALICIOUS

PDF

86.4 KB Created: 2021-07-01 00:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 503a58b565536b2c59c87f40bc2f07bb SHA-1: 93d7275afcb9ce56ae634941955bbd4e6ac9b3a4 SHA-256: 2489fcd86b9e994e815dce731022f406a9cec94f8862e5845c959d99740f6353
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attempt. The embedded URLs, while some are marked benign, are part of a larger pattern of hosting content on potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4c18f772781bc611e5b8a18b68a57ea1/73542030124.pdf
    • http://aliglobshop.com/userfiles/file/90168009509.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/vabivaxafatimer.pdf
    • http://lamexmarket.com/uploads/files/bofameguxixetivamum.pdf
    • http://bandenplaats.nl/cmsimages/file/nibudadelirefipaku.pdf
    • http://businessvaluationapp.com//fck_files/file/kitixopawufal.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081004edad16---55690653288.pdf
    • https://clumba-indoor.ru/files/files/88389509195.pdf
    • http://aliceinformaticasrl.com/user/pages/powuvifepatetumi.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c708ebb0fa---mifedig.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6d969369aff582a1e60401cbf39c648e/kezowuresalazel.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608113b9e7c76---lujerudoniselutob.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4700c0fee---xotezagajawawitotaposuw.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16093015757b78---37306269879.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7460b9269---xolefijajetivofikesiruz.pdf
    • https://2acontractor.it/images/file/25902147205.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6791f8330a---76941471932.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ee2d49be---13433202113.pdf
    • http://short-story.ru/upload/file/29107464159.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607562ce6979e---78879172586.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3b88d7ca---sojemiwagiti.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/46506350bf943cc92b78a1a5a9fe6722/ziwuwovegepikisuwafijivog.pdf
    • http://absolutelyneon.com/userfiles/file/42400895459.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a7818b063---29667120431.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+create+neon+effect
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2b.bin
26ca12bb6e16c16109b21426fef82ca5cd4bae6e2ec8a584dd07f36a5713b74d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 17876 bytes
font_01_sfnt_off00011c28.bin
427765b593bc2e87b009e4f68202458b899cd090108b7e61020fc5b52f91fbaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 10100 bytes
font_02_sfnt_off000132d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132D2 16792 bytes

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