Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fc11b24ff1a94b…

MALICIOUS

PDF

91.9 KB Created: 2021-07-01 16:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 045b0932a0d6454c78fc74552db63ae0 SHA-1: 31413fa22fed4a6cefb1133afa73afb2d759e967 SHA-256: f3fc11b24ff1a94b4339d91394b1e815f1f4e85bf77dde0cf4786457f97f17ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous links and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.findvoters.com/userfiles/file/velozogujukukexib.pdf In PDF document text
    • http://n2nlah.org/UserFiles/file/werix.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ec04c2fad5fe0b868ebc8df8325c31d/2287646032.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bd82b752a---nivadubukejet.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/jemivogoxefuzumosiwis.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/labonot.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609889c51af1c---44811473667.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/21839094655.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/63098501175.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/kakumebewemuzafotawuded.pdfIn PDF document text
    • http://feast.to/upd_file/rimibemovikobeb.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/30341961536.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd1470ed11---vorawijepade.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d600fd7685---zaxuse.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210619_9E9C7F1A70ACF981.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbcec2bc5b---76550165711.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/14048536423.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/14379528202.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2f763030---dokamuvilejogesobimaz.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/voveduvapejogoxikenipuf.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f40341ae6---suxorejigosilofuri.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/87755714423.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/8d9s8742ou8of11m3rf227g6b6/zazawijowaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=when+did+the+4s+iphone+come+outPDF 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_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 10644 bytes
SHA-256: e9885465dcdafb1357ede482ab80cdeca2d520cdce6564b431cb17f0c91546d6
font_02_sfnt_off0001325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 18052 bytes
SHA-256: 1ce2af5b5d19c262494b559bd6612f9a8dae336c1f9ab6e03b129b7d28494455

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