Malicious PDF — malware analysis report

Static analysis result for SHA-256 0091208287300fc0…

MALICIOUS

PDF

89.9 KB Created: 2021-08-20 17:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77efb35cc7ce143b22007ab912a2c19a SHA-1: 4a893a1015522877e418f41daf40a809bdae49fc SHA-256: 0091208287300fc0d48eddd4dfb94d83f2a87f7f4263804ebda0fd98757954ac
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic firings indicate the PDF acts as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains, suggesting a phishing or credential harvesting attempt. The 'Password-protected archive lure' heuristic further suggests the document is intended to trick the user into downloading an encrypted payload, likely containing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://medvor.ru/uplcv?utm_term=uno+karten+sticker+whatsapp+iphone PDF link annotation
    • http://55pluscommunityspecialist.com/userfiles/files/nogugonojagevevigabuj.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/49160191597.pdfIn PDF document text
    • http://tencanpowder.com/d/files/lekomufozuti.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/gires.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609266b95a6ad---kepisiwozetoledolujivotu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d58cbd5e08---45390228926.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/e6ec7a297dd8c2b19aba728cb583adce/58086159609.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/87210307034.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/evke3isoudhgbt051evs935bvk/23085591051.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/9f4331c91518317551dbd7115e3e0e6f/89541645706.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/91626450409.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b20e6e0d4de---xasizowegonadiduwusu.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/kajasukemaxeminusofikosuj.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/15289817753.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e003e3427---poruxala.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094754f50c01---31065702909.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/76707723162.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/bdnm557epaso55n3aih4v3faqs/45385603940.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a85a5feea12b1d14ea8b3360b07ee217/45430851114.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/tusixibopak.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/nepupaganubegitevilelidu.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/35333516623.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/42heqki85u6kis5u7jis4gpqk3/95926731361.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/wixebilapibeleravoxeni.pdfIn PDF document text
    • https://studiorampinelli.com/file/10940076691.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 16300 bytes
SHA-256: cf48b691868a259c9a47f330077ef157433a70b9d03653b9765cd482506ba2f0
font_01_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 18344 bytes
SHA-256: 91caf3a5251bbc7e05a322aed4a5f4afe88c6eec65938b888d24d09393076d9e
font_02_sfnt_off00012847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001405e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405E 10612 bytes
SHA-256: 8333b0dd833d5642b893cd2ebc81f7fea3af1ba2859521fa2c2f52894b117af7

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