Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba74b0be53f6c124…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 20:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5b7a286fdaeba64711696488e1bc123f SHA-1: 808a75e0cc4dfaaa1dcaf23cfde3dc2313f85bec SHA-256: ba74b0be53f6c12465f45e92dd05889a3481ddedeaab7c245beb8eb6b09efe9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The links are presented in a 'link farm' format, suggesting an attempt to direct users to malicious content, potentially for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=download+pornhub+apk PDF link annotation
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ddcebc0f4---boluvifavaz.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/xojuwuvasisenafowujakan.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/javodipesadaxumomonupop.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/rotexusutizexov.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/fidaromagipukip.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/38182941500.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/40226075395.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9232822951f48cf07e7cf199e8110ff0/33794449419.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/91214748027.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/15866607234.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/bulisakitazel.pdfIn PDF document text
    • http://net-work.cz/data/file/xiwatafidowutokidideras.pdfIn PDF document text
    • https://attack.lt/images/files/38138194722.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/rowigadiwopajifunuge.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/24469380724.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161343e286fa62---gasipekejatorararonoze.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210912210639.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/sejopesut.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/xodewokokimil.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/30444650273.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/34115700709.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/25430226345.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/zokiziradadevunajepipuw.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/24819081564.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 18880 bytes
SHA-256: cd1317a2e4cb14729167cebc14f3d48254aec17284493d803bd11bea3544e2b4
font_02_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 10416 bytes
SHA-256: cb7256242d6c0526c997161479a81cdfbd4d401a88509208209cdeaf825c7769

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