Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84dbd13336f7cc3…

MALICIOUS

PDF

95.9 KB Created: 2021-09-06 15:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4fe3ab689b41192a083334e5fd86c7c1 SHA-1: 7aa758b5ebc958b4cdea18b1e4c1f9b46ce6bcae SHA-256: f84dbd13336f7cc3857ceb6a755db953ed87e8f4f73aa3aea1c0c959120707d2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/sodhvcpgrbjd5kmpart7hisn9i/kijixejapibemoruraladi.pdf In PDF document text
    • https://weborder.cloud/userfiles/file///56788373576.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc025ac503e---zomakesavisemeraro.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/id2fja3f3ethk3frh1ma4a2eth/dumabap.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/jisarebanejebevu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f288552a19f1e4c29ba82320bb63274a/sivoxim.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/suzizoforabu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ade03a915---piwip.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/noled.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/1096258147.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d2fd8123---42093789811.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/32713145145.pdfIn PDF document text
    • https://amblamy.ee/upload/file/xaxilesazofaxumimati.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/44001615371.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c90fe52aa4c02990835e26ce8af4dfbf/tenokekorusivavamilaler.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/lutezavabigiputikugoxo.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kq9kkj4c32gclqebgi5milorgp/wigafamomu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9dd48aa3f---81811320332.pdfIn PDF document text
    • http://maidichike.com/upload/files/lefevenetul.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094b093ac691---49601557364.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pieh1pukjsgcppngjg4j8hdirl/20627443504.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/wisinotajawikugonezap.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/penoxebekiduseput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=english+reading+books+for+grade+2+pdfPDF 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_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 11012 bytes
SHA-256: 6187f983035eb31e24080d22d6cdddf54947a7b6eacbc1cbd1601d3a16137912
font_01_sfnt_off00012a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14243 18332 bytes
SHA-256: db4c225429088eab60b42fd2828ecba43b9c0700d86fefbdd83357f6148bf1f4

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