Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f61729f80f366ef…

MALICIOUS

PDF

92.3 KB Created: 2021-08-06 21:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c3d5d26bf2df6d2f9886a913e8f9bdd SHA-1: 033764a81959a3f6e66c617cdccf750105c20491 SHA-256: 9f61729f80f366efdc4b40c401712e88fc832f200326e5302d95e1367bb9b4db
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting an attempt to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://winecellarkeeper.com/ckfinder/userfiles/files/66995992563.pdf In PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/rowirunovugozotoba.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/rizikupiwuzututobirex.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/65961698933.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608734f2930a2---bemezem.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/dubuxapib.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/vuvexowopupuwadoxalojuri.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/fuwulukabef.pdfIn PDF document text
    • https://schmitz.cz/res/file/66300073968.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4517f2d9e0---40763957318.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6817005660---xezilutatowojeko.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/57930120642.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d2vit6ksfdlcqu18b9cutgk4s4/62806880260.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608943e5ea93c---29539485745.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/67888223934.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f1eda4f36---nerufalapijetav.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/dcc4ea63372e9430f93c89cd0ff4280f/sefunu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107c56a85f83---54056779051.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/diloj.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887c0f823ad---56999481495.pdfIn PDF document text
    • http://hidramaco.com/files/files/vudabujifixalutipeg.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/86851756546.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/hsat315a4aei4aidvd4j7l0ti4/57959011857.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094319621177---memoludujubejonewifenopim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=myers+briggs+type+indicator+test+pdfPDF 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_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 17320 bytes
SHA-256: 7661b86e06b68327edeaaa135db99ba0bfa6f7ab7c8d5d182b53facb6e00ea2c
font_01_sfnt_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 10996 bytes
SHA-256: 2bba49d9d81f9b02a5e58172f303133516b815852f5b72bc8d3dac1425573db1
font_02_sfnt_off00014b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1