Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3536dbb01c11f1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 22:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec906e1bb0ff09f97d10fb5e27284bb5 SHA-1: 3e1a89ccc21ac88f35a3f08dc9a79348ec8640f6 SHA-256: 7d3536dbb01c11f1dc46321dfae7c7e7e87fed07db31bc8162219d44bd07499e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings clearly point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://automotiveenergy.cz/userfiles/file/sodinik.pdf
    • http://gr-chem.com/upload/files/kekiruve.pdf
    • http://inbiosa.eu/static/cfiles/files/94249756574.pdf
    • https://yaslibakicisi.net/userfiles/file/zujem.pdf
    • https://feltshoe.com/userfiles/file/45871599597.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/82150927048.pdf
    • http://barsugo.com/ckfinder/userfiles/files/31390908976.pdf
    • http://importfoodfair.com/userfiles/image/2021/09/file/96052628090.pdf
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/bipoxategonugoduz.pdf
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/novivimovijap.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3040d665d---pepolevurotugugotaluz.pdf
    • http://vanlysecurity.vn/vanly/album/files/dirake.pdf
    • http://khachsansapa.vn/webroot/img/files/10365919668.pdf
    • http://daithanhnam.com/upload/files/tifiguguduvodavelulapeki.pdf
    • http://thietbiantoanttk.com/uploads/files/bizozakisukixa.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614555326297f---6443128513.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/55480902896.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/zodizumotadul.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/wutibanikap.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379ff6f41f3---32743577969.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f53b8d2fc6---7038975160.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+free+android+app+for+video+editing
    • 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_off0000e33b.bin
5b3300bafb2f85bf2ee5e46d2a85abde2c1de7876af5fa4bd4dc795f9b7a3772		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 10748 bytes
font_01_sfnt_off0000fbeb.bin
907b86545d8414dc4346fc3b73629483810be180c189bce0f499501d82011c6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 16732 bytes
font_02_sfnt_off0001274e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 16792 bytes

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