Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e942f975d3cbed6…

MALICIOUS

PDF

85.7 KB Created: 2021-06-23 16:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bc75f8ca627601fbf70e8153a6fb24a9 SHA-1: d1e4d2b6a495c279ab31acc1757985c285949fb8 SHA-256: 3e942f975d3cbed6b591d1d6db09bf2a0567d6cb242bb334289803da3d1fbda8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://huntic.ru/uplcv?utm_term=saturday+daily+mail+crossword+answers PDF link annotation
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c99dd9c9b6---16067335067.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9349318a2---36102297369.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c83ce65094---9016246091.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/vadorijopufijij.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/7a09d75182c187df5b0897ebf43a5783/43329454116.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/72267830364.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/dk89hhq903om64t8qdah0n0idk/repokovudajujimezar.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/53427107085.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/4815919201.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/99c7d6ce8e8befdb7c3152e1c311c140/dujutezolafikulixojej.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d58ca7736---derutiva.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f84ef1a2c---84509446648.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/batesibitakutukosufox.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/91979833451.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2a0b0ddd9738b78456f9b13790f7eaab/tedixatetuwuvowofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC166 6416 bytes
SHA-256: 4257b5aed261ccb96d7b6b52587b843e34ad9d65b35b79aec213b77d78697daa
font_01_sfnt_off0000d13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 5380 bytes
SHA-256: e5e01dd43fb850e2923f4af31949a467e675c493dc8f3dc37f67dc5c10e476f4
font_02_sfnt_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 9876 bytes
SHA-256: 967144d5cabb6107d972b620a0fcd7a3d8ba617982aafe7eecab7c8e8e9b3e09
font_03_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 11012 bytes
SHA-256: 85017d8d83723e48bd06950345c1532d24833c5e87edd33ec2fb4c6be3bca45e
font_04_sfnt_off000128ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 16860 bytes
SHA-256: 3b87c1fca17d7dd6961136c8eda37c914cc658eaf521c7970a6a577d3c8a07c3
font_05_sfnt_off000140cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CC 1740 bytes
SHA-256: 30155f06aedfb79de9f70f3e8e1372addaeb1c7fe56136300e854ed0c3fac0c5

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