Malicious PDF — malware analysis report

Static analysis result for SHA-256 b595fb419a44b7fc…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 14:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fbace177f2ca501469dbd02a88e992e SHA-1: 233e56c37164f7f3f248cc64f08760fbdd70d3cc SHA-256: b595fb419a44b7fca10a2c44895bfd2968e6dbeb2bf8cd3f88dade254b3550e8
156 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 other PDF files hosted on various domains, including compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://ketchas.ru/uplcv?utm_term=hydrology+and+hydraulic+systems+3rd+edition+pdf
    • https://muzpony.de/obrazki/file/ledugupog.pdf
    • http://studiofapas.it/userfiles/files/27245660231.pdf
    • http://2m-m.eu/userfiles/files/52181986879.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/wegazefaxatababutobite.pdf
    • http://nbnjl.com/userfiles/files/kodasurolapok.pdf
    • http://beloezoloto.ru/userfiles/file/31479423619.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/tosipuj.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/547652556ceb81b4504ceffe0fba3dfb/sobifevukoka.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0f590df36---dupanelewogekekugo.pdf
    • http://hwayinn.com/image/files/20210909_193810.pdf
    • https://groupburuemas2.com/contents/files/tamazuzomanod.pdf
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/jibafitubo.pdf
    • http://qdjshg.com/files/file/nofijixuretosap.pdf
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_C02E483F35368346.pdf
    • https://www.institutvzdelavani.cz/files/duwalikofop.pdf
    • https://schmitz.cz/res/file/webizegedoteno.pdf
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/vofetejubobonejip.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/eibfo9b6qihjdlod4saulj73qn/dumoxetenutoko.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f00e4db4a---puzawazevu.pdf
    • http://baove247.org/upload/files/zijezinuwa.pdf
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210910132146.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/02d7173319b23bb957b763a606a556c3/94386949705.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_off0000dc39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 16792 bytes
font_01_sfnt_off0000f450.bin
0475867c2c99d8fa568815591fe13079031a066fcb6972063a612e10aa2e3042		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 11444 bytes
font_02_sfnt_off00010eea.bin
24b07bafc8746fe19a6efdfa2aa2910a496fc18d81d88c148f6dfd697ab5fc1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 16744 bytes

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