Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a558f150b756d30…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 09:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91d544be3e7e85e87e374a0fb080d6b4 SHA-1: 1374d2cd220b923d028d27edceea996573e27a40 SHA-256: 1a558f150b756d308193c95079fd1e860306f635987465fa8716eba2f20255df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the structure suggests it's designed to lure users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://beiks.info/public/file/bubojimat.pdf
    • http://geteffective.biz/uploadfiles/file/26957288267.pdf
    • http://redeyeldn.com/userfiles/file/zinawitexirok.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/55080859367.pdf
    • http://elmbbq.com/uploads/files/pogolifedujilij.pdf
    • http://levant-tekstil.com/other_files/File/mugilafibuwevonemota.pdf
    • https://moolans.com/uploads/files/gevipo.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2572bd409e5230a32a7c52352c6655e1/nufaxod.pdf
    • http://szpk.hu/_user/file/68161051001.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160846a4c4b5af---99642010086.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/52233033882.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/55d24506a7c17fa49878e3c53a5fc643/94939274545.pdf
    • http://nhactheducthammy.com/upload/files/xasokojujewimajezimi.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160fa5af99c178---52931705619.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607638802688e---femetukojuzulajawajore.pdf
    • http://mini-garden.ru/userfiles/file/20944984362.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8l2gnvmdfk1p0k3iluhu1mavv1/sevevimugegu.pdf
    • http://fullx.net/files/8118856050.pdf
    • http://www.rify.us/cms-uploads/files/62183571588.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8b732160bd7064503e80e878f32bec83/bedodima.pdf
    • http://www.lbtfilm.com/uploads/files/desagilomidisufa.pdf
    • http://jongauger.com/ckfinder/userfiles/files/11079046532.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f999af6b0---xafef.pdf
    • https://pisangmanis.com/contents/files/sufopoku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=greedy+method+in+daa+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_off0000de90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 16792 bytes
font_01_sfnt_off0000f6a2.bin
e3e06b32d5e9d2785e17e176331ef11b86c5194739e1d4628e487509a3b7eebd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 18564 bytes
font_02_sfnt_off00012718.bin
b22d2780f3e10ce21af80b317d473528e76e7a1e3e66528ed2d2dcf283599ce6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12718 10704 bytes