Malicious PDF — malware analysis report

Static analysis result for SHA-256 c197efe1a95c40da…

MALICIOUS

PDF

87.5 KB Created: 2021-08-12 20:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef8cbe938b01583f1d98a61faf03ec64 SHA-1: b6a1068f1e8cc1d7441b0eb705ee8f7a886e7170 SHA-256: c197efe1a95c40da865d4b66463afa3cbe066511eeaba5a6732d3cfd132d5972
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious documents. Heuristics indicate it's a link farm pointing to compromised WordPress uploads and potentially a credential harvesting lure, consistent with phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076201c848cd---49132481145.pdf In PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/wozisofijiwurumuza.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/vijavusuxod.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/nevotuxafekojetijumejovob.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/dabigutakofonoludalan.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/62931408562.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077891ff2081---lerol.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/wumofejunizi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/388irh0m5vl0k7kqk3evqo6un6/rilesukepolesup.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b72275d4---noxuwurulolo.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/bebinasime.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/sb8rms3rbncm4h0t5057p4t106/79555915289.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/6129187713.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a250a350---29029905980.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ca6cad80f3c7dd43321d89d6e5907fa7/47519977414.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/xozalefumoxidurejaz.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/0ff7e5969104432d67381b44a38e0f43/49729922262.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/nuzugobag.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/86579591881.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9946d07407ce1ac782dcaebbfc2e2d36/bosapiduwetakoxago.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/84057709635.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/5r84b2n9pa0dfprg6vmobaivl7/jupeninovaga.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/47748884623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+game+gta+san+andreas+indonesia+android+apk+data+google+drivePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 10980 bytes
SHA-256: 34b8cc24bc6b05f3dc29b4479573ab39742f1eff4d0326fbf02275a6994f52f9
font_01_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 16944 bytes
SHA-256: 78d3180c4c0ffd62df3da9171c52667219b425aef5c8f11b3369d3586ef30fa4
font_02_sfnt_off00013763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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