Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfc57eed78d61bd…

MALICIOUS

PDF

91.5 KB Created: 2021-07-23 03:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c44128d0fe45a73bd478aadbb7b1ebd SHA-1: 9fe971c8ceaf02b4a06529aacde4b2a861cd0278 SHA-256: 6bfc57eed78d61bda3eb42c592b73cffc41a64116bfe2eee5b00b6299eae8f6c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the presence of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://kimtuong.vn/isc/public/files/fckupload/file/zopevaraperam.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a770c870ae2fd312059882e827de0e57/7082843881.pdf
    • https://tosto.cl/ckfinder/userfiles/files/fidozosewotimid.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/62e7f81614a18226f6174470223977c0/66852488993.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8685ffd0093275a576cc855d3b45d1b0/15601654014.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ee1ee11d029c426eb949864eaefe325a/xezatawi.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/kb6askkvj3ldvin72ursmg5u94/gubawirifigubejefedumawat.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/t0tr5fje0cgv7346fi74csq4lq/zafefa.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c05fcebb0---90418003644.pdf
    • http://hesexpo.com/img/editor/image/file/diladazolivep.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b90facd73f71633c8c1cab05bd0237db/zegola.pdf
    • http://kozszemle.hu/uploads/files/36989051538.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/cjhs7sv6dnpo3oq3d208b361mr/jamevowonagila.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c56d9c214a400cb0fc56471ed9c8acf7/70928237399.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607276dd178d1---81723988167.pdf
    • https://telenovella-bg.com/files/bufirad.pdf
    • https://kultmotor.hu/images/files/60509101717.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc49dec9594---segijutijaxawejerokogere.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9f63549405e2d58f9aaf92b94f05b1a5/zogugedasaf.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2709de1d2---nejexepegepujejefiweriwut.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c0ddcc1a---guxipenajuralegomezokalav.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/75635689510.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tms+the+museum+system
    • 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_off0001052f.bin
ef4cea3f871888284abe32806c7e8f2601438efae11dc1ba3dfd9eb08e60e4bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 17412 bytes
font_01_sfnt_off000132f4.bin
d65792f6c7e41239dc2babeb00f42dabaa39c624021b2e0fea899278f54300f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F4 9928 bytes
font_02_sfnt_off000148f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148F8 16792 bytes