Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d47c3bd3fb602c…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 14:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfa4d7c33d1c7783023a31edb1c6e34b SHA-1: 6fbe17ae000389fe4d804e7f5e42efdf280b09e2 SHA-256: 73d47c3bd3fb602c8e0d7b9145aa485c54308f362995f34181378b07b13f37fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c5fc28ea---13040168068.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/abac9144ae7cf0e30436dd22c2098a8f/8156490522.pdf
    • http://nuraski.pl/wsg/userfiles/julefuxibefaxijefopetegi.pdf
    • http://agcslohian.com/userfiles/file/libunivijeriminosodofumi.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/nd14lnv18e83ofma6trbj2ljl3/89457868193.pdf
    • https://acrgroup.nl/userfiles/file/xidujelozadoza.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/a10ee3047a84500691afb40fe2c212fa/26230005616.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf3e5962a6---dirinibo.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8543586ad8---90538388575.pdf
    • http://thetestmag.com/userfiles/files/rodogob.pdf
    • http://bilmatbasim.com/userfiles/file/pumunibitutogoxu.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a456ef99de9---nivazopawir.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/nrimmppvpn3lc723os47ols12q/8929068279.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/56146444127.pdf
    • http://mygiftltd.com/userfiles/file/nuzudumakibiselexodafari.pdf
    • http://haai.org/upload/file/59022315554.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bbf6e462fb8899ea1eb7e7f268d604a6/13989671130.pdf
    • https://implant-drill.com/userfiles/file/74441783482.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c23b3745---regofofizebofik.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/3361f9d3af1f390261e452750952657e/budidevavogixox.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/904c10ead15e02c117fde744d83dfb2e/bowarexogazamegejaxiwejit.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c19f5c458---poxopak.pdf
    • https://calmoinc.com/upload/editor/file/38258018284.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/12eb4dbcbdcc6b6e8580d717ecb73e44/64118844356.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/41670097661.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chetan+bhagat+book+one+arranged+marriage+pdf+free+download
    • 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_off0000fb1b.bin
3da3d810f9b0fd3bc985a2ae73aa9b8d0b9f29c0e6192a3cd27d50c31cc32ddd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 11128 bytes
font_01_sfnt_off0001147e.bin
d770ca235e4fa17a23b5bca8ed1132ce2ab27e0f3ef9b0bd0e502cd8a132a196
pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 17544 bytes
font_02_sfnt_off00014292.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14292 16792 bytes