Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc07ad7b83cc8b5f…

MALICIOUS

PDF

85.1 KB Created: 2021-06-27 14:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2e13c47f823d03b2cee161439c83cc2 SHA-1: 1eb38d4f43bda911c602c30e104594d196d2bb93 SHA-256: bc07ad7b83cc8b5fcc0c94de280a9e1052c7fe31b19da9fd3f761b0f8bde04a5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to domains that are either compromised or hosted on disposable infrastructure, suggesting an attempt to lure users to phishing sites or download further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://synerhu.ru/uplcv?utm_term=what+to+do+when+overeat
    • http://msiutilities.biz/documents/xokun.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf1fd5951---visixazixivetami.pdf
    • http://mgocsm.in/userfiles/file/23049572760.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b4d659babe4d8ced68a82f17995f5a5d/ruparib.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe5c94f731---60642302701.pdf
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/vuzale.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d9bb9c5b90202fb4e09e3a3ef0cfb004/bedimazegowefetokixize.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a0388917c---49480375770.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/2f9933a38368ab8fa62b75fe312a5332/95183546536.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2339bf2027d3ed353dd9151aa674cc39/36369413868.pdf
    • https://cristalensi.com/public/File/gufizanaxorimakaxu.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c878341b---semogi.pdf
    • http://sewakendragroup.com/userfiles/file/86583002667.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/39505302608.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a31f1b258c1---kulovukabalowa.pdf
    • http://brnc85.com/clients/878796/File/tezobuwurivorosamomama.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d4537739aff816782059d56c21671135/62826964816.pdf
    • http://bociany.sk/media/file/61285796549.pdf
    • http://andlupa.com/userfiles/file/tizipoxerojewigopirowifip.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/442e35e8fa023376b4ec87594e93ee99/74786102544.pdf
    • https://tonwen.org/userfiles/file/gumemivur.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760463a87fc---zalevelifavuxone.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fb32a37bd8d410f2841804407c890e32/5442092849.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/dawudutijaxifolizad.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_off0000ec24.bin
7ecc7cb3d98c1a9a3bd0ca184b2152a716870ff2ab80776c0341e60bd1abb6d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 10184 bytes
font_01_sfnt_off000102f1.bin
b9686b4c3cb4b2b9453c094b943f73ea466966cb5feaca1acd91dcfa5b7f79c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 16588 bytes
font_02_sfnt_off00012de8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE8 16792 bytes