Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa77cd94a7a97bdd…

MALICIOUS

PDF

85.4 KB Created: 2021-07-24 17:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 758ffabedae42a9640eeecc3d2548fbf SHA-1: 606d8ad2a53fbc5b9235298af67c0f1fd53deaeb SHA-256: fa77cd94a7a97bddfc6b4580e37b423703712d6382d2051aa36032cdbcd25247
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a290c9d619---48813845881.pdf In PDF document text
    • https://leuphuotcamap.com/uploads/image/files/87790450938.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/66551388837.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/93491326103.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/40984802817.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3539576f54---2449838519.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/kamijimafisebuzov.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3031234246---xogedabiwejis.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6f04df78206568076aa723f5af4148ea/nopobulidurel.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608061bc01a54---93443619211.pdfIn PDF document text
    • https://shopabrang.com/images/files/jodogazub.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/s75e5f43i6c34q0i8vgjgeetbh/67449588239.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/16297648546.pdfIn PDF document text
    • http://greenld.com/userfiles/46205422624.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784e96981f4---6335713313.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b582dcabb556e6c5ec497ce80bfdc26f/lewosipa.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160887a2ba8329---wifotusamikow.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/nitojolexutisavu.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/914kq8brimgr5g9uecdjan4ev5/gotizasemuxinun.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/51981064656.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/69400688262.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/tupotuxilowapewiwuxibabow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=myer+castle+towers+boxing+day+trading+hoursPDF 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_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 11184 bytes
SHA-256: 17be409cb4989972b9a4f38a099ceb4802fdf92c87e55ab5428353573fbaee41
font_01_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 17148 bytes
SHA-256: 40cb637e1e98b91c19a75ca1d1d352522a24269b5c66f5d1c2d7a11693f59dab