Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0ac90c0de2ea40…

MALICIOUS

PDF

91.3 KB Created: 2021-06-27 19:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee3e3d10c52afc85595fda9bc1945fb5 SHA-1: f544ff2f962fee7c73a44c65037c005a8c67c3bf SHA-256: 3f0ac90c0de2ea406bb584cd549ec5f7f53f87bf6acb5a7b93853058743b877e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on potentially compromised infrastructure suggests an attempt to obscure the ultimate destination or to leverage the reputation of legitimate sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef56c5f3bb---salasedugikizugozisopoxej.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd46361b539---satanebapo.pdf
    • http://qunjl.com/userfiles/files/31605252589.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/cn4e2nip3rd1e0aals18r7iuii/11858748462.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5fb89492---71615874446.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/281851b38d84922a4f52ea4103498d83/77923473997.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2opg61h7n4emhsvfcm8aaa93op/newanot.pdf
    • http://ecohost.ru/pics/images/file/51834109015.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-17/20210517213043763264.pdf
    • https://vieclambanhang247.com/upload/files/pukarigeza.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/001fb0160cc7847c67969f87393df573/7821875482.pdf
    • http://fashionflutters.com/ckfinder/userfiles/files/xokoxunuzebowuxebezajaku.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2d52557fb---poxofimofawav.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe4932d8f4---nusazotereziraberi.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/151c2a436030a6dc142b1da755eaf3ee/35830410080.pdf
    • http://karunb.com/UpLoads/files/lunafelixezewituzod.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8af521944fca83c38ef635939a2ab26a/16634235782.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/70992a5feafd103456a64280538bc2d5/91284383142.pdf
    • http://didaconcept.com/admin/fckeditor/file/61827203343.pdf
    • https://viettincapital.vn/upload/files/vititifegexa.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pm7nvei7s7rl4q0eejmtuo5d13/38474895589.pdf
    • http://fipjp.com/userfiles/file/vaponiz.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8nr4batda1c0ksbhlatb89e8l6/puwinarolesutajo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=present+simple+affirmative+examples
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d3.bin
5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 16160 bytes
font_01_sfnt_off0000fe57.bin
391ffe20a8fa9a4eabea2e7f836a137e9f5577654385b4d13c5c0c5c149aa101		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 18864 bytes
font_02_sfnt_off00012f5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 16792 bytes
font_03_sfnt_off00014772.bin
70f501c1b40a6c84837dfbb2510b3288efb8fbe64329f4e1e9655bc57f409d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14772 10568 bytes

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