Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a08929fc45cae5…

MALICIOUS

PDF

169.3 KB Created: 2021-07-15 17:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 36cce3d03f116eea33a458d08510b36b SHA-1: bfeac3895a426d6edd6aa62d72bd4166dc2a5387 SHA-256: d2a08929fc45cae5014e38f914874e821c3073af4cbb2439ef0773aa8298b32c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm, a common tactic for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9679

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=suzanne+humphries+vaccines PDF link annotation
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/etme36v20pn90tv6fe7m9hchn3/15993182158.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/zolodilotalejixotakuti.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608183d4dd121---zexodidejegifodamepi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607361196da95---tekelewajirijenuwe.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/15680185318a3c04876abce639be21cf/lubibugibakajafe.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/tipesowidekekinukefaj.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a7c04c1ae---weragomowiweketotu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/3773113f1848454f6af6e591a2e54b25/22022195938.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/54060187197.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/rekebosat.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/kupisisox.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/531833410.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/zidafetadurifewinejidajem.pdfIn PDF document text
    • http://xtra360.net/campannas/file/33971516375.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69408422084.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/ronuzopogarikowebofo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609feedab42fd---sujemedivumuzuvi.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///daxajiduzixitemixaz.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/85scg097ltmegovlapqbp272tr/89658557232.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/mazabolarax.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/voninegikaraserof.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df7e4eacc29---83985951278.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/85529305985.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e70f942f23c---pokufuwenerefomofisi.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/6762860061.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_off00022ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AD8 2420 bytes
SHA-256: 35fdd25bb21d439972991022160f52537d4b8a655e8a407989856028f020582e
font_01_sfnt_off00023539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23539 19076 bytes
SHA-256: c0299069daa69dc56f8e3ef451560f4804a250bc51bb4d6ebc7b1a3512bfcc99
font_02_sfnt_off0002666d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2666D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00027e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E84 10676 bytes
SHA-256: 088e8e94feb90e95c2174779f04f77afe6e03f2f8b991e8f321fbf53558f22a7

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