Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2719a5b4b8de09…

MALICIOUS

PDF

81.1 KB Created: 2021-08-18 00:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a13567ca980a54a316837da40368eecd SHA-1: e84c431fe9aabff3b0bdd476fb68a4f4fbe0f75a SHA-256: 6b2719a5b4b8de091ac9603549abd42eb0bbbe8cfdb6161d624afc97502e3047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a lure for phishing attacks or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=maze+runner+scorch+trials+book+characters
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c8361b55---32437436947.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/nhv0njingjg9i5ul54s920u0t0/733096936.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c5b34078---ribefegilif.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/loxejazemanater.pdf
    • https://alternativecarrepair.com/userfiles/file/zilezaf.pdf
    • https://alternativecarrepair.com/userfiles/file/pujemamabiruwi.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2da5bbb6b7---kagokizekibize.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/49ff7ff6227d2dfa882ea3abfc3df3d7/95685032918.pdf
    • https://ludifrance.fr/userfiles/file/duzasefotuwe.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3f7372fd---46408530364.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/58380860315.pdf
    • http://tokstar.com/_UploadFile/Images/file/nuloxatovafu.pdf
    • http://sromedical.com/file_media/file_image/file/jujefewanol.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd63fadbc3---66196958710.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086941f01e76---84360649185.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95a07e017f---jojigefelurofap.pdf
    • https://flyags.com/editorResources/file///janefetuvozuveted.pdf
    • http://restavratorstvo.com/ckfinder/userfiles/files/42036202220.pdf
    • http://wefocusdesign.com/upload/files/subowe.pdf
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/23259820570.pdf
    • http://formel1vermietung.de/userfiles/file/vexexidufixofojazewepuz.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/72483830742.pdf
    • https://ilcaminodaugo.it/file/87032110177.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d033e7e721---13716459639.pdf
    • 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_off0000db27.bin
b4aa3c414538eeddac348d2b03a9fe97eb2bccc801c67c487f4df29918315b54
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 16468 bytes
font_01_sfnt_off000105f5.bin
20f9c31e4924f4633d5a896eca751250afc0874e13a54b8bda56609cce7d2f45
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 10712 bytes
font_02_sfnt_off00011e8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 16792 bytes