Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f52185278128bd6…

MALICIOUS

PDF

104.0 KB Created: 2021-07-22 00:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 48e7cdf8093d5b9263276fedc1831925 SHA-1: 33f0db1b52db87e958cf91fbabd518de900d1ede SHA-256: 2f52185278128bd6b45055ac96957ebfd644de34d65f4534648327931a6e31f1
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to websites hosted on compromised WordPress installations, suggesting a link farm used for phishing or malware distribution. The PDF structure itself does not contain readable content, but the heuristic firings strongly indicate malicious intent through external URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2r6mcm4u1ddilra3l6gn0euli7/wemiw.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a4c49066810f4703fe20106efba14882/39612002581.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f50dbb39d0e---mixez.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/momowigomidakeviwugemowi.pdfIn PDF document text
    • http://scro.ru/pic/file/gevikizavajidokubutos.pdfIn PDF document text
    • http://capital96.com/userfiles/file/86840137092.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/gemesakugur.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/6074358021.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e22da2e90fb1580eeb9a642a42a47a7f/74983214980.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/23f9cc5f7d6b3e99d0013f0f6244dce9/gegesetefirimamuguzadoxo.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/nejodigemewofi.pdfIn PDF document text
    • https://foreningenflex.se/anvandarbilder/173/files/vewijixuri.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/19581435986.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c88eb1a9517---wururu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763bbb9e719---42104770444.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/jopovikevu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a053d2fe---kudajejiwime.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/milizadab.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f72cae22---41609464099.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/mafijeza.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a237edd4bd---99947506235.pdfIn PDF document text
    • http://hanleyresources.com/images/rejitofopuf.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e12e01bf1---degebiwotipupar.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a60b647e---30487824082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bad+t+wordsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001347c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C93 10008 bytes
SHA-256: a844a6fe03edc8ac724e680b6454756b5298b422dd46f9c869ee1744121bc60b
font_02_sfnt_off000162fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162FB 18384 bytes
SHA-256: 5675d74fab0101137727548c5bf2e0dd85ed3d6aa1202a112c890b2dd4f5fa94