Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36d7116976bcfc4…

MALICIOUS

PDF

89.4 KB Created: 2021-07-10 06:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb4413c322d2341961bbccb2699b7f8b SHA-1: efecdde00c5a13d5bfde05bd7dc4a18473e5f62a SHA-256: a36d7116976bcfc4a7bf40b955fe26bf9d922111313b219f432beebc9bc6f815
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple distinct hosts, many of which are hosted on compromised WordPress sites or disposable domains. This behavior suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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 http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/91bingsbd8gf5q4og57skoeuv3/34790524979.pdf
    • http://ingmarcofaedi.com/userfiles/files/nugeriwexuwujuxum.pdf
    • http://harchovyk.com/userfiles/file/zewaburuf.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091adc34f338---buwunasodulub.pdf
    • http://jshtextile.com/UserFiles/file///tulivipolejot.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c191d833102---16171816621.pdf
    • http://kaizousha.com/js/upload/files/defixuwepomegowip.pdf
    • https://amblamy.ee/upload/file/31052998444.pdf
    • http://blessingsngo.in/userfiles/files/83772309143.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/55cfb0b0f6de41e71881a23bc47e3d2d/54524203604.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aecfc5fc3---78820973225.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f539b17eb1---sufuwe.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aedac55ad---falemadupomavidezivupeb.pdf
    • http://toyteepee.com/uploadfiles/file/2106300405539582608zwcn0.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/90109149305.pdf
    • http://www.gonouvellezelande.com/files/67284910629.pdf
    • http://contactconfiance.com/files/files/84856906949.pdf
    • https://communeouchamps.fr/userfiles/file/fodiridimafonijat.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/msp8rf3dbgi1l9kk61p9kmbefc/zosidemiloro.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b27e24be6c0992d5a769facc6c4a813a/matevonukimirefasivazoj.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16081aa16a7413---25499914238.pdf
    • http://bnblspecialities.com/userfiles/files/leperajalusef.pdf
    • https://arichaindia.com/userfiles/file/vomilidosopek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pictogram+puzzles+and+answers
    • 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_off0000f789.bin
25d073f15ccade865e6991ff7473a2c9be7661448c4b50ca9ddad253c2dbb9ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 11104 bytes
font_01_sfnt_off00011155.bin
c5ad537c4e58d19a4c14ee0fe6ffb3590db9a49fa14e374efcc77e2a7784a200
pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 17972 bytes
font_02_sfnt_off00014057.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14057 16792 bytes