Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8d2ad1f045f90d…

MALICIOUS

PDF

80.2 KB Created: 2021-08-31 12:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 871bc820857d583851e7375d348c2f86 SHA-1: 57c259958be62989c14b8322d4e0399a8a5f9c1d SHA-256: 6c8d2ad1f045f90df7c4e8ec75d94f0f4759046ff97f8357c4d9a234f26a27ef
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://women-for-marriage.com/ckfinder/userfiles/files/varuni.pdf In PDF document text
    • https://maychieuvinh.vn/upload/files/45762345226.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9d14c9fb5800538d1ec3ab61bba967c2/vesilig.pdfIn PDF document text
    • https://appfacile.it/file/71465137554.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/bumexuguwigevabexoxa.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889fdddb99a---95755721909.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e12bacee0a---kuwetebamokidekuke.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/jozuseruxe.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/443d59c839c10983d5a43c5d9ed6d73b/94619589598.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/kikelofegipa.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/44571496040.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/4261817871.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/tadotepema.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/531ba260a7da1378e4ef93293a337d2f/pejowetelegebesajurenoma.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/manidotegufe.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/misumoduxilotol.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5ac6522e5080fc0ecbc998a2e9c82a8d/mabifopok.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/lenusevupo.pdfIn PDF document text
    • http://gestmase.com/media/images/file/gesuwugopunolatu.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/53366405495.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/4jcno0lgj3nd6ug7so4gdlesvd/36496698967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vocal+point+i+stand+all+amazedPDF 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_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 10604 bytes
SHA-256: 225a02eb2b5f56853919ff4db6538d028f06820c4085654713091f6ecb573244
font_02_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 17640 bytes
SHA-256: ed560a325971318ed16878851b43d85ec6a20f272f023e1b4637bb5ecb5793eb