Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5a7cbc76da1736…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 12:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc2852c343cbf7e2a44476b911a1a526 SHA-1: 1773044e643d0ee681c76f6facf5dfca63ae3abd SHA-256: bf5a7cbc76da173618135c7dde88f47a2d42c271926a4c91922b9fddff3bd2f0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, indicating an attempt to distribute further malicious content. The presence of a 'link farm' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection or download of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vasekurzy.cz/userfiles/file/54589301745.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96671fa52---69706475415.pdf
    • https://himalayanthailand.com/image/upload/File/79932936574.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73685938554.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/52170d9e410d9d3a8e015a791ffb9c7e/dukokuvab.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e83bd816e---96260690179.pdf
    • http://etenindex.nl/images/uploads/wekifexowolororu.pdf
    • http://konemara.hu/userfiles/file/45955449463.pdf
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/dedafekodakozinen.pdf
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/85708545440.pdf
    • http://xn--nellieskche-0hb.de/userfiles/file/64860663569.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4c9705d6---zodiridokasonulizukakadu.pdf
    • https://035620126.tw/upload/greenkitchen/files/47649971941.pdf
    • http://szm.hu/userfiles/file/gatofegalafisugapogifebu.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210911_7DADF4EF6683E6C8.pdf
    • https://saksisan.com/upload/ckfinder/files/80008530442.pdf
    • http://biomehl.com/images/content/files/93251431724.pdf
    • https://olamare.com/img/uploaded/file/88431965252.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613d353a899c3---wenebebafoxewasalimo.pdf
    • https://igk-lilienthal.de/downloads/vekakamakotixe.pdf
    • http://szentdorottyapatika.hu/files/10007509915.pdf
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/48932147948.pdf
    • https://grandplaza.bg/uploads/assets/file/5444277472.pdf
    • https://artesapanaderia.xyz/aym_image/files/2274907340.pdf
    • https://ooobelkom.ru/ckfinder/userfiles/files/70460186585.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vishnu+sahasranama+stotram+in+telugu
    • 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_off0000b9a3.bin
f43886c219e357ae0829950373ee954979e1775f2bcf86dfc805193b30e3334a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A3 16240 bytes
font_01_sfnt_off0000cf91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 16792 bytes
font_02_sfnt_off0000e7a8.bin
41d70172ec18042825d5f04312fcec3d217e07bb7ff58227531eb66ce609d46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 10624 bytes
font_03_sfnt_off0000ffce.bin
3db6e7ae5c8e4dadd3d6c8f5c90384a496b8a03ca3cb85aa5bf2f5e4fefe6df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 19160 bytes

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