Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39c8e43af6b24ac…

MALICIOUS

PDF

94.8 KB Created: 2021-07-19 08:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7021a4117716f203962704b86154e66b SHA-1: e3d81a9a544eb13c0d55c89407430942a3546216 SHA-256: d39c8e43af6b24ac79d45361086b5b182a2a7edbeb95d6ec8b4c49af0f93e724
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to download further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://cartopack.com/Images/file/xesejuzabar.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/113f0b3f630532ea7b333ee41d3d4273/1066878724.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7c172fff---vakozitulidukoteguv.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e77bab0911---176964123.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/nuzup.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7f7eec242d9fd492b563cc0b37414049/fafupeg.pdfIn PDF document text
    • http://olympusflights.com/files/files/vutuwezetozusogaj.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609871cdc66f2---jarukawijos.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/jozip.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/vadoruvetew.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5cp1m7ko6ajvl02m567dtvkmp3/kadavomatumitazode.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/64265681052.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/227fb7bdbd6b3f999298387aef9af3d4/tuzonugukuxerezuvit.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/61817907755.pdfIn PDF document text
    • http://synergyproperty.com/images/files/36354891489.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/9h1ed668ng3t86pkfvttnm8lvc/vabogope.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5db340458b---pojukojumi.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/pamubuk.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/nkgr7d66gtrdk2sen0h5srut77/lowasedugex.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834298b4b75---17163029567.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/soxofej.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087b27e3f419---3303902084.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b49474abb7eba5cd0621375e281aef73/losudekunagerekobagel.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/37070550184.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/20439534489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=relative+measures+of+dispersionPDF 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_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10872 bytes
SHA-256: fe3b74592fcda0df42c3a24118dfecc9fa4d36490f0c841ad8082f9d94fe6812
font_01_sfnt_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 20692 bytes
SHA-256: 4bb61e0447f66b52acfeb8958a62ad71b30e1038257a68d416ad6506495cc47d
font_02_sfnt_off000155e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1