Malicious PDF — malware analysis report

Static analysis result for SHA-256 34aec96c640953f2…

MALICIOUS

PDF

91.9 KB Created: 2021-06-29 23:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09b91ab3421c6e7214ac77a28bb3f115 SHA-1: 479c8e5d662afbe9a08719d65f4c171ab0597680 SHA-256: 34aec96c640953f2a034b274c9d3a906567ef9b53d7f438885f81174a4c8573f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used for phishing or malware distribution. The PDF structure itself is also flagged for suspicious link farming and duplicate object bodies, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d249c21bb---51022100283.pdf
    • http://lavalnerina.it/userfiles/file/45051172442.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c87a8f996---25319734658.pdf
    • http://4bx.pl/public/file/xinuzapisimovu.pdf
    • http://anandamsanyal.com/userfiles/file/xijeji.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4cfd437356de30abde40efb0d5501079/woxilovo.pdf
    • https://renault-service.com/userfiles/11070555795.pdf
    • https://benqmusicworkshop.com/fupload/file/pixerosurozinux.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9hh1bmfh8f3v3de879mipvm1r0/zemimugasogokar.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/1vpcb0tjjvu4h0nk6o33211d71/9783717378.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/786fc769c504e885f0a128ec4aa36a73/55870636858.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ca06488c4e---49460440170.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f9319c4b---81937949497.pdf
    • http://stepasidemedical.com/images/uploads/file/rowuradaxixudakuvivo.pdf
    • http://broadmoor79.com/clients/864886/File/nabezagodud.pdf
    • https://toskov-yordanov.com/userfiles/file/66619827685.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/95e19180d3ca6ba03b226468a85c1d9d/28896039930.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/llme3spjsqv8vhfjdk30mdqr90/86595714679.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d78012c00a---2631247674.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160729cbfdab84---62157723758.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fr9dcon14ohhipo18re3f37ual/50322576568.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e867428b6---selafiterixifet.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160833c7a3a145---zijovekarevofunubo.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e91770a7---93789695332.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=indoor+photo+poses+for+girls
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07c.bin
a42ff004c407dd6585d3679e8be806d5ec024e2ab32ac66d9cacae7ae471cea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 16392 bytes
font_01_sfnt_off00011b07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 16792 bytes
font_02_sfnt_off0001331e.bin
f50eedc15ebc72f0e9a97b9b145c5ab0ac75380abb80c2a1004f294780ffc697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 10568 bytes
font_03_sfnt_off00014ade.bin
705a86e7c0d716fb621e464cf5e291f513ed0a354f3a04b3970286843a8b14cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADE 16532 bytes

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