Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f204e1d2f823b75…

MALICIOUS

PDF

77.6 KB Created: 2021-09-22 17:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 753b7b5387759b922ae7c3e0bb7c73a1 SHA-1: 329fd2577624c84aa661d55d8cd4e7da0c5ec891 SHA-256: 9f204e1d2f823b755f1cbd6d23553b953145ef8a6359b512dfb63ae79f1cbb38
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://syntellect.ru/Repository/file/89371487398.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/rogunirezirivitu.pdf
    • https://slide-bearing.com/d/files/64793518491.pdf
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/figikefavix.pdf
    • https://vibangnhadat.com/uploads/files/94327397141.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/62679035609.pdf
    • https://igescanada.com/ckfinder/userfiles/files/jenis.pdf
    • https://sieuthimaycafe.vn/uploads/file/nobedapivazuxilowabet.pdf
    • http://nadiadsa.org/userfiles/file/23150443032.pdf
    • http://abarappresentanze.it/userfiles/files/24336263727.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/galiremagu.pdf
    • https://guijek.com/userfiles/file/tubudonexituzugetukitufaf.pdf
    • http://fivelscope.net/fckimages/42258953223.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149a4abf3544---xibadojasogilibumeru.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b26685bef2---vijetorivesavobufotu.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/ripunenojabolisikajubowo.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/7603c9033328dd28c86ef9b624f8c2e9/bomumoxilasegufozesuw.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/xurumolojoxufidadibaj.pdf
    • https://jatransfer.com/userfiles/file/tenafakizuw.pdf
    • https://irantruck.ir/data/file/28324449023.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16149ee3721a6d---vugafiwirigixibomabaro.pdf
    • http://polyalpan.hu/_user/file/zidubewis.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/73598355758.pdf
    • https://hongming-eco.com/userfiles/file/21139747504.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hack+game+gangstar
    • https://www.thc.gda.pl/ckfinder/userfiles/files/73156894512.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_off0000ca9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9A 16792 bytes
font_01_sfnt_off0000e2ac.bin
3de6a96519b1b918ef2a3d99a5848db1ff516691099efa4499a0a9fd365e2ceb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 17648 bytes
font_02_sfnt_off00010ff0.bin
40ec6fd8191925850cccb5a6e033ea0792df3afcf26bb2604cefa5cd87481f7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 10396 bytes