Malicious PDF — malware analysis report

Static analysis result for SHA-256 97587f57304d0afb…

MALICIOUS

PDF

75.2 KB Created: 2021-06-27 03:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1a95879a366974b90ba7e1bf7ee57a0 SHA-1: 80db75cd2768a864363d0f275e77c781dace48d5 SHA-256: 97587f57304d0afb5446b055be5ac7a8b70c138e80dabda2fc94e69ea6fcfea0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://nolimitscenter.be/peausitive/images/FCKeditor/file/22240957512.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/be12ddbd381397e441355fb1a030f5cb/dapowugutekopijexinuz.pdf
    • https://dhesient.com/media/bokalopagogesuviv.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e317b4806---19447556353.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/6216a5df5e37e9ddc1c8fcd133cbc1ac/80594300794.pdf
    • http://protok.pro/upload/files/gibirani.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/9etu9kc2d6d7837kj3gt6tobf8/77660702716.pdf
    • http://dzstock.com/Upfiles/file/86075786318.pdf
    • http://elitaliaweb.it/upload/file/pepowunukiwujo.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d38c5d539d122dd7a6986f7ef5428470/72461110541.pdf
    • http://songiadahoaian.com/upload/ck/files/tanokozigufonudomawege.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c44be1f0a114a1bc0cf3fb019e5b4596/55667773301.pdf
    • https://agentcctv.com/userfiles/file/girowadi.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66947cefc---71146892619.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/0f9191a28b52cb9d6ef273d027d41098/pejomezi.pdf
    • https://yellowstonewildlife.com/41082938834.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5d72b7eb---xijisikofuzisimo.pdf
    • https://avenue102.com/uploads/file/samafupegof.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/c4826b061429e71eaf32f7b959f03c87/xigifo.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d03d4144972---zejivoraxitifibuwanupajik.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4f49311c---41312352669.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f8d84de2a864658678c0b8a11213673b/69845850549.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=csir+ugc+net+mathematical+sciences+analysis+and+linear+algebra
    • 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_off0000c22f.bin
6206b46e6c2c7c4e55620dfe992dc84139d671eb5552f01553154e732d52a113
pdf-font-stream PDF embedded font (sfnt) at offset 0xC22F 16648 bytes
font_01_sfnt_off0000ed9b.bin
50d978b97dd7895daae87b57d4c297fd21510b536a4f848c61a1a1673da9a665
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 11080 bytes
font_02_sfnt_off00010714.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 16792 bytes