Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d505005b1cff1f1…

MALICIOUS

PDF

108.8 KB Created: 2021-07-29 17:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1df3b5ecb4e3726872f53b8c94f6536 SHA-1: fc5b15b775de0b48f1e6e283d2f8f799ea379175 SHA-256: 0d505005b1cff1f16bdbbbcd616a88905e2770fe6d6141b6dbffeb55347ff6e9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not containing user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://infrive.ru/uplcv?utm_term=what+do+engineers+do+elite+dangerous PDF link annotation
    • https://tyeetomsfishing.com/userfiles/file/kiwaxerugog.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/91683693592.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6bb197df7---65693796833.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/5sucbm5l6hku592l7ghijd8bal/nisalebomojilaza.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/gevivekapomazesim.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f96c4e659---gapepigugigimutiju.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a97b7cb4a---56957714683.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/rotutebiguxixisu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/51c6cf2c6f6d893dde7b02340e8a352d/dinuriwibajopinelomun.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/05gmtruchmidud8abugihh95s1/32569999573.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd91f98e69---xojaludepekulufifu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/a1m21ddsvd31bugfbfogkn2gjs/fozawemuvurumoxor.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/32774733076.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/widuwuwivatin.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080faf27ad9b---wefibize.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7bfeafdb6865fef0d01536e1332cc2cf/96420008591.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f944ed618---xakopegiv.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/7527075698.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d337b818c---nefizuwijipaguzunomuwimij.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160707b053f873---derujekixorerowobakexozi.pdfIn PDF document text
    • http://pneusmarene.it/images/file/jiwuvukagunoxojopav.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/21900986825.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1085e588c4---59064287859.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE8 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off00014363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14363 18228 bytes
SHA-256: 087e951b72db463f423561926d7c375f532bb4d585c9d2a08e5c67c43bcae3dd
font_02_sfnt_off00017340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B57 10620 bytes
SHA-256: 0ff0712043af393ffdee2d45bd708f0df4a3752607b09f59b3f477fb9d2d6d4e

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