Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c65c3e69b5edb27…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 16:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f829fa51c2aec0e3d822ae170986b126 SHA-1: 1cc6540610a161c57dbd52b9196ea8b69c570665 SHA-256: 9c65c3e69b5edb275f0a541fb67dcf68cc3518dfcfb8cf59d6e741f52bb0c578
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for redirection. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests this document may be part of a multi-stage attack, potentially instructing the user to open a password-protected archive. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://parquet-cortes.fr/data/Files/ruduluxofunesupek.pdf In PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/jetob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425d509559e---papakibitapenepiluvu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613688e0e45a9---41775899695.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/losiwemafax.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/nabuwogukewagedawawut.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/95207722528.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/91603055960.pdfIn PDF document text
    • http://vladekoservis.ru/files/90935997739.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/milif.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/64458939914.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d160ea0f71---gulofelosakesidimirofez.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/56616477243.pdfIn PDF document text
    • https://krusomying.com/data/file/61518781291.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/50248647081.pdfIn PDF document text
    • http://vhshf.de/File/37197631059.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ea9ce02b6962afbc5549256821377b13/desubijeverefike.pdfIn PDF document text
    • http://htwy.com/upload/file/zokamibaniniz.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16138c370db6ae---veropemizavib.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/rugodinotixo.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/57572231601.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/23912570034.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/59609193075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=wibr%2B+wifi+bruteforce+hack+proPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 10668 bytes
SHA-256: 6b017696715e88260afa9cac1db8a40b0606ebac8db85b10739c0f08cfb389ee
font_01_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 17712 bytes
SHA-256: 9d4f0d67bc641ced3538bf96c44fe8cddecfb7b8e493989da309338e999c8524

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