Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba3d5e4cf0a0d41…

MALICIOUS

PDF

117.7 KB Created: 2021-06-30 19:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90590afab095d7542625137d347ee013 SHA-1: 4fc2d211fb84acbef74d67b824d983497d037213 SHA-256: cba3d5e4cf0a0d4113544dbcca76c1e0dafe53c5eac0c598025d208f7ec55c51
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, designed to act as a link farm. The primary purpose appears to be directing users to malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26543d0dee---nipuwejukaremekep.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/d6e9847ec69a9830f2681cf302124b25/62692078632.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607983313436c---nidofupuluxababajewemoze.pdf
    • https://energooptima.hu/upload/File/pokale.pdf
    • https://loctra.net/userfiles/file/jubax.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/xetumupopebovepozulor.pdf
    • http://studiotecnicomartani.eu/userfiles/files/45446274486.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa991b72ceb---xemaweve.pdf
    • http://krevue.cz/UserFiles/File/xijawolel.pdf
    • http://doggystylzgrooming.com/admin/photos/file/20177841277.pdf
    • http://cnzgks.com/userfiles/file///fixematititepogevi.pdf
    • https://anmoul.com/userfiles/file/24607164571.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd90d2b20---fupibidemuxopasibesoz.pdf
    • https://alianzatours.com/imagenes/file/jesasokatokulov.pdf
    • http://szentistvanpatika.hu/upload/file/pomiriz.pdf
    • http://glenbardwest1965.com/clients/0/00/000b938fadf99fc3242526d4297efebf/File/47408288215.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f1a929f78130d6d1ef701fa3d483812d/biwubaseta.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/r1117f5e478a9hh83eh1gmjgq3/xubofatepisifesawab.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a078620e304b93df82df61d05e777544/19099092657.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/885e529e30c4b85ede2329783cbc1d58/50291020029.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a16e5942---lowap.pdf
    • http://copy2d.com/ftp/image/file/80928079945.pdf
    • http://tourister.kr/userfiles/file/xadidipabonozebolufa.pdf
    • http://digjamaica.com/app/webroot/files/13845310386.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7339c955c4---najeletusudodogu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=brain+out+no+94
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015589.bin
ba2ff35c0553987aa382c69feafa46a9fd0a72f38e6190c8e074ed0333ac03b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15589 18436 bytes
font_01_sfnt_off0001847d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1847D 16792 bytes
font_02_sfnt_off00019c94.bin
c92dfe3a28bd60b13d58694b29e1236006a904980610e310f7b131a7a014853f
pdf-font-stream PDF embedded font (sfnt) at offset 0x19C94 10156 bytes
font_03_sfnt_off0001b373.bin
6eb162b33eb88f8db5296bdd2517b8e3d9015a108d8cb0c1e5d83c65b2485e3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B373 16284 bytes