Malicious PDF — malware analysis report

Static analysis result for SHA-256 3814e06460969582…

MALICIOUS

PDF

89.5 KB Created: 2021-07-02 20:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37bfd0a21b05d08b231fa39eda6c4fa6 SHA-1: 5a6d4c2c2ae969d3f16dd8ae4e96bd26f3b5de26 SHA-256: 3814e064609695825ec71b28fccf2833315f15395e61fff5ea267915ed2c655a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the embedded URLs and heuristic findings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ea8f1b77---kukerodozujewabavafubel.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fc66fdac7bc022db10b5947ff1a2ed64/98364155812.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/999a28cc069cdbb3db591523e2d48389/gapawonalafufinidadexogad.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/83296538552.pdf
    • https://bookatowncar.com/userfiles/file/jedutagutofegafodojim.pdf
    • https://llsindia.in/FCKeditor/file/doxoza.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609287fb4ff33---46162116815.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c709a41a775---9005449222.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088c30bc8b16---jabotebobananusifadaze.pdf
    • http://bpabv.nl/uploadfiles/file/89304734854.pdf
    • http://piotrkowska77.pl/zdjeciafile/nukasuverokaduronenane.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7e5vt41n258k0d9cd30a284u7p/womelolulorazobep.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b18ce5f4d---sozusuvapimutuk.pdf
    • http://bluekeydigital.com/images/pic/file/51187680622.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/bbbsk1t7d9gm1hrfn5ac5c096h/13174223483.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bf4bffb4---tejorogajesawulur.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608803845e6ad---19003210857.pdf
    • http://donauwell.at/userfiles/file/zokukavud.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae260579332---44069915742.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/22d3d984c384cb7c5e3921afbf2d61ab/kiboxumovalelasiwetedaxo.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb10af0d09---67746473512.pdf
    • http://pokemom2.com/uploads/files/46727003727.pdf
    • http://cs-web-design.de/ablage/userfiles/files/jetubagitug.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ba129af2---42681114407.pdf
    • http://almar-bus.pl/userfiles/file/vafam.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gta+san+andreas+remastered+for+pc
    • 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_off0000fa9a.bin
130ca75655f67e02bdcc3a84ef85e29c3c96fcd7f476d22c069ed31368f1f972		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 17452 bytes
font_01_sfnt_off00012803.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 16792 bytes
font_02_sfnt_off0001401a.bin
bef15c9e1a144a788dc2dae3f7318554716ef446d326c196d1c1b050900dde5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1401A 10680 bytes

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