Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc0c672e5f6a486…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 10:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ba38719846dbbf06c8a20a433a87228 SHA-1: 055b119f255aa6543313b2c38b3e39735bffa7f4 SHA-256: dfc0c672e5f6a486b5f33d4444f0ef4f7965cdb2d18d111f94b276278972b40d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. The document body is unreadable, but the presence of numerous external links suggests an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/xoxifodobufudejizovom.pdf
    • https://detectiveoffice.net/userfiles/file/gezugog.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebbf21234c---250484002.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/94795128560.pdf
    • http://gibisch.org/files/files/fowogezivu.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f602be8a2142c332e2b2af1e7f0f25cd/zodonewanurotinok.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d4e084c65---54779717302.pdf
    • https://bravo-hk.com/userfiles/file/rowevi.pdf
    • http://ji-tien.com/userfiles/file/17962826262.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/rituropasodazabo.pdf
    • https://mimpishio1.com/contents/files/suteteduloj.pdf
    • http://af.ssla.ru/images/fornews/files/tajebexekaxakogufatudux.pdf
    • http://zdravi-kromeriz.cz/files/file/gaxumisofofevezuxapexibi.pdf
    • http://lejuriste.ru/files/file/limomubidukir.pdf
    • https://siemreaptraveltours.com/userfiles/file/77261266595.pdf
    • http://vtvxm.vn/userfiles/file/xagivufenaxixikowuwati.pdf
    • http://dinhviht.com/images/newtech/files/nuwodizilesinomoboso.pdf
    • https://xeroxexpres.cz/userfiles/file/47008826148.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/802437a7d908b750073d06d41e94f702/gubudafowesizevi.pdf
    • http://sms-dk.com/FileData/ckfinder/files/20210902_045E2FCC16044DEF.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/ragitaforevonepakikexit.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377e56bfbd2---75177781785.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=k+means+clustering+output
    • 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_off0000d85a.bin
190fdba207eead700b84a4b715672a69e53778031354851d67b43cc10e22eeed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 18500 bytes
font_01_sfnt_off0001094b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 16792 bytes
font_02_sfnt_off00012162.bin
353348510f8179d6a17a0a0e66da3ad489a1f9d5700fabe1a64ac5d9fed1c465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 10808 bytes

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