Malicious PDF — malware analysis report

Static analysis result for SHA-256 38437112215389b5…

MALICIOUS

PDF

88.4 KB Created: 2021-06-29 23:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fb0d2b41bd444f1f36345b51c84c0e1 SHA-1: 4e13a712944fced4fb4e9a3b8f5eda4270414bf2 SHA-256: 38437112215389b5e3ff35c8a5c26039551b74be0c64cbed41b37677bfe62e26
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4ksjruh6rsrgabia9rml3o6qhn/15613629525.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fe005146---gojipajomiliveziwumowod.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b0156c1b98c38966cd0aff8a2dea7969/konojojerogi.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e546d681---bafaleluna.pdf
    • https://bruceautoservice.com/files/file/5100221458.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/5j373o7q1p4bfrqb8rolk0chjv/gefedisabusifujujorif.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8f06aed1a2622efb0a3aa37a3998c46e/banosobimoruxalin.pdf
    • http://resheto.ru/users_images//fck/file/berakotomumofekarox.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/72ca79b199bea526d6d945ff7a4f6953/bamebivogadamigela.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c2d87f79---7142717843.pdf
    • https://seeandhearbetter.ie/img/shop//contents/45350901720.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/73951939759.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f99c03cd---galuwiwujimemurewaworo.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713f0a947b3---93918358427.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609d916e4d5bc---tizinedugipafib.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/030ab72fc960273dbcae6b1ea5db5467/7163767611.pdf
    • http://obasekiestates.com/UserFiles/file/59397031222.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8b28477f---11132970737.pdf
    • http://healthywithhart.com/res/file/nafopabafamejujis.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/lfqsllhu5rvp67988ejsuarji5/wobuzubukituzinus.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7c4d7c63b439ed81286e113fe257269a/xujabofifam.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/juripabamilo.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/615843a066462d392047052061483ea5/kinikidewabivaputexe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=captain+and+skipper
    • 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_off0000f546.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 16792 bytes
font_01_sfnt_off00010d58.bin
b206f71b900fbfdbdd8784506dd243b1a34306a6ac86f0ca8fb30abc9d61b892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 17700 bytes
font_02_sfnt_off00013bc3.bin
de738895d95c356099944229bad42159aa796455c241835ee9cfa38502dbde6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC3 10340 bytes

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