Malicious PDF — malware analysis report

Static analysis result for SHA-256 942807b066389362…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 13:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a2626b16ac03a303b7bfedca220c52e SHA-1: 6a00836f0e7774a6aa95166541378fc4dbf39254 SHA-256: 942807b0663893629ca76f5c3fb188734f824e89dab89c3d834735e45ee3b879
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=iphone+10+price+in+bangladesh+unofficial
    • http://nemochem.cn/upload/files/kadesejopuvixerakerafufur.pdf
    • http://modero.vn/upload/files/mugozesiguzijeburudev.pdf
    • http://carshopm.com/js/upload/files/75108829635.pdf
    • https://nyirfa.hu/uploads/files/27762136947.pdf
    • https://kstraders.com/userfiles/file/mikulekojevani.pdf
    • https://www.fangjin.org/ckfinder/userfiles/files/2556793017.pdf
    • http://luxcottage.ru/stroykamen/userfiles/file/juxixizijaditibirab.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/59da93d96632f85753d8cd3cf787cc00/mobariwajumonopiverifetaw.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/09245b157f9ff4b46148a89e53b438db/59019429928.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08461df8a---ripubixevu.pdf
    • https://equinox-e.com/upload/files/modajopuku.pdf
    • http://twtipa.com/upfile/files/2021/09/09/fanuveziwuzud.pdf
    • http://ei-windykacja.pl/upload/file/gipetisavok.pdf
    • http://gonzagafood.com/userfiles/files/xofudonevemozagegid.pdf
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/70595923704.pdf
    • http://yurisolomko.com/userfiles/file/7446992988.pdf
    • http://cdkuys.handysociality.com/upload/files/muxutavamanasusumidof.pdf
    • https://mumegram.com/userfiles/file/83530916308.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d364330134---40394191881.pdf
    • http://studiostocchi.eu/userfiles/files/42500238682.pdf
    • http://studiocariola.com/userfiles/files/remutuwop.pdf
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/siwedusunax.pdf
    • https://gastriklandsbf.se/UserFiles/files/72316620349.pdf
    • http://ptichile.cl/userfiles/file/406083733.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f883f94b70---84019709883.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_off0000d853.bin
101dbe0889e669d5c50f6b7237ef94f3ddd132fa1098c81f64cc5d76fb7bc62b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 17884 bytes
font_01_sfnt_off000106cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 16792 bytes
font_02_sfnt_off00011ee2.bin
2a9602b96fd14167097a8cdec6ceea960aef7ef6948b6481be30af55268d131a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 11164 bytes