Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c10d2fb42dd140…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 19:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 871be78f181e8a05cdf7d33c4520af94 SHA-1: 415e980bb78d3b453990bcd1d4365f280e1f0942 SHA-256: a2c10d2fb42dd1404cbf101e6ae3dfc445eb6a57f2d3a868d9f91898176ac3f3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The primary attack pattern involves luring users to click on these links, potentially leading to credential theft or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/cad53f83a598a2b74a3a074900843052/95326994801.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3abac716d7---jizewi.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb70b93192---rejin.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/337f32447965595f099c93ca307d3e19/tunajulovozotu.pdf
    • http://navigator-nsk.ru/userfiles/file/bononatije.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/bd8df105dcfb8ae05aa670cdd59fd4ff/vanesofesebogusuviwuw.pdf
    • https://nestuby.com/userfiles/file/fomefoxag.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb33b68ae---foxodumotivu.pdf
    • https://personnelcle.com/userfiles/file/xaruxupivibobikebix.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2790e0f8df---89936762989.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/tovadobumexoduroga.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cdd29e8bf8ca3c1e7cee64e255836dbf/86161928219.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffb41325d---xonijipovaz.pdf
    • https://studiorampinelli.com/file/tesivejape.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/51458917999.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4bdcb4f1e6968526833bda256bd92621/butivefe.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acace6134ed---voxupe.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3028241d3---57127761757.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdcc713da7---64586393963.pdf
    • http://czytamzezrozumieniem.pl/userfiles/file/34151640926.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ee9e2361---jipalofareko.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4e0e07da65d3513991b187e88b7f1058/latux.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb13bacccc---31184879001.pdf
    • http://arcomproltd.com/userfiles/file/tawuwikigusawubivufunizer.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=infinitives+agree+with+their+subjects
    • 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_off0000ea44.bin
6af8eca890e4a7f96ae68d8db54f5c5cd36fc084e0bb900aa66e96e811421f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 10920 bytes
font_01_sfnt_off0001038b.bin
1192437a126b929583156ab801119188961b460c5ee4b8891dbcfc4d53077fca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 16720 bytes
font_02_sfnt_off00012f17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F17 16792 bytes

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