Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a88e9d70f28a3aa…

MALICIOUS

PDF

79.7 KB Created: 2021-06-30 00:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1daa2cedb40d1026d8b8c199f98ea13 SHA-1: 6f5ac9d12415f409dbaa0c22f2f8903d53c8539c SHA-256: 0a88e9d70f28a3aad182ed348a31b9fba101dd32d45cae54674dfe0b6c92f0fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the link farm and the detection as a 'Phishing.Trojan' strongly imply the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://soechi.com/userfiles/file/66150946054.pdf
    • http://ackerviewguesthouse.com/userfiles/file/robakixibik.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95801d6f8---19059006178.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/af1491a69a42d5b55473fbc86ed8bf12/49317057510.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0754457158---23829536599.pdf
    • http://jinshi66.com/uploadfiles/files/banijobebokidusenozi.pdf
    • http://accessprecision.com/userfiles/file/bezoda.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/cd5cad8705e77617969fd85343ee51cb/mojifuvabotitebajizu.pdf
    • http://adance0112.com/upfile/editor/file/fitowuvadijuvakobav.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/darekagixemujilalobupane.pdf
    • https://burgas-remonti.com/userfiles/file/61423736463.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d86907536---70396513694.pdf
    • https://akproauto.com/nbloom/fckuploads/file/vaxowavorulametuzowed.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609988b7675de---juzusivupogetazevajik.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/6639956664.pdf
    • https://iamtimeshare.com/userfiles/file/4737732341.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c56fbf667adb759c042ce0eda2b7cc96/famidopiximo.pdf
    • https://noddy.nu/images/file/33907202190.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a1ec8c8e86e1b15e906e71d97afd2a56/12551860580.pdf
    • https://cambodiadriverservice.com/userfiles/file/wurusosuladotalenujol.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073058780b0f---tazosunupuxanivujulekuled.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ur13g6bu14hekcl078fpdl77e3/redotasusofepemo.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b788cdb846f---gokowas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=all+hxh+character+songs
    • 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_off0000cb37.bin
027e4d44342f48d51365c1be728b677c1e12b88bfbe583e9ada0ed26ed2f74e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 10500 bytes
font_01_sfnt_off0000e32a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 16792 bytes
font_02_sfnt_off0000fb3c.bin
348a87860cfe99005db6b398f48da0540e365164a7b64bd76d91542297c74ae8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 17576 bytes
font_03_sfnt_off0001292d.bin
4399651035424788af89a61815135da753d7a2ba72e38705d6f444edb27b28e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1292D 1704 bytes