Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4eb4be51728a57…

MALICIOUS

PDF

79.2 KB Created: 2021-07-19 03:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 603e926a673a1b8b70f188fa33dc9892 SHA-1: dcc1caac05b4406b362c02c5d7b09d51041afc1c SHA-256: fd4eb4be51728a57c92ab027490b850144a57093b7a4b2c6fbb13d17b3022e92
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous URLs pointing to compromised WordPress sites that host further PDF files. These linked PDFs are likely designed to lure users into downloading malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e1854d86---bewuxevofedupowade.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ta8sqh57flspch1040d60utpev/wamemotimox.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/43765569412.pdf
    • https://www.nevjegykiraly.hu/userfiles/files/29393317038.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/09jtuel3qti92oji91e6r9cgmm/78617569945.pdf
    • http://etcad.net/np/upfile/file/wukotevefofonosogox.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae93c05073---5326558193.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/34156897459.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/qfigr28hj4rb8sui89kimpcu4g/89293526909.pdf
    • http://amphorabeautyclub.com/campannas/file/guratedo.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7b90eba9---62767309133.pdf
    • https://aquafilling.com/userfiles/file/66868091093.pdf
    • https://areicon.com/images/file/46325363491.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c7f01ab2---57682197290.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/97747973650.pdf
    • https://artenika.pl/fck/file/17107647180.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e52c4017c9---94268030195.pdf
    • http://geredekombiservisi.com/userfiles/file/gukexofetumexiki.pdf
    • https://widepolymers.com/userfiles/file/dazomepudetuwek.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/24250ef1a0939252ae4348da71b689c3/razaraxoposowiki.pdf
    • https://juegosinflablesarizona.com/files/23972628577.pdf
    • http://www.ecostroyservis.ru/File/55988567907.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d049f9d0---71859977580.pdf
    • http://bptramptour.pl/files/file/79614593273.pdf
    • http://syuncyoku.jp/upload/file/77350642864.pdf
    • https://bem-sa.com/img/file/35152576684.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+fragile+vessels+pdf
    • 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_off0000d3f3.bin
2328159580b7ff5865c03e19629872a7b4623f4930b42befb60a3676987312f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 10484 bytes
font_01_sfnt_off0000ebac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 16792 bytes
font_02_sfnt_off000103be.bin
4767f1bbfdf78e74df5abe3be07a3e722ae5bfd767c6f00324734091bf6e29a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 17404 bytes