Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e74aa64af266ddb…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 04:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2869b3cd974383810b0919b8a637f62 SHA-1: 3937e844e545cd074699b9b4afb2722cd3fcf60e SHA-256: 0e74aa64af266ddb2b4dc06aa28ee2b47ada7e3ccede6f15013e820864f318fa
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, hosting numerous URLs on potentially compromised or disposable domains. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a6e9ed4e3423525e8084fa36e63ab31a/15178537901.pdf
    • https://hkbca.org/UploadFiles/file/20210617213749152.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/24659845703.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/791cca939e2c63a271c7793c5c4dbcad/sijujibivotar.pdf
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/vexanenakerifufixapigu.pdf
    • http://spreewaldatelier.de/img/editor/file/baduzu.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bde29b2c1---sarivibanumonizojov.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc9deea9aa---84896627941.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16070e407c2b2f---44143203760.pdf
    • http://annamsaigonlaw.com/upload/files/jifelutovu.pdf
    • http://jrpst.pl/userfiles/file/89426302124.pdf
    • http://gocreate.termall.pl/upload/fck/file/zorijenusosa.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c636a0ae694---11798161711.pdf
    • http://szentimresiklos.hu/upload/file/xemutozi.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4ce1d43c278caa1b7120dc454ed02584/62065402130.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/1visa0c2uhvsu8e50f20160j6q/29101480222.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7n0hrhmk5vh8ar84epnr29uh5t/66486154754.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dff95e8b70---98467339252.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6dc3341c---79314352352.pdf
    • https://onlineadda.net/ckfinder/userfiles/files/22986698197.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/pefafopaneravexasijufi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=images+of+teaching+and+learning
    • 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_off0000f484.bin
b14cda7c67e376830026bc09a8f4d6a4d9df46fb5e2dd702ff4c9c4d11609f0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 18172 bytes
font_01_sfnt_off000124ab.bin
b15ee3debd23ef7cf04260f9fa448c8e5f82b29111dc5310b2c8d81f728f126b
pdf-font-stream PDF embedded font (sfnt) at offset 0x124AB 10876 bytes
font_02_sfnt_off00013d65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D65 16792 bytes