Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5dddbd8f691e55…

MALICIOUS

PDF

122.3 KB Created: 2021-08-18 10:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f0d8ee827ec4ae084b590dff6cdf8c2e SHA-1: 96de6165cbf348a884e7a868b430a0e990dfd2db SHA-256: 7c5dddbd8f691e55e142d2f2e20e9f9fe99e902b21663f4e6f235a979027c65d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress upload storage locations, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs confirm the attack pattern of directing users to potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://jancsoalapitvany.hu/ckfinder/userfiles/files/66394145789.pdf In PDF document text
    • https://chpcentre.com/files/file/20472529233.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e5a6f8d2442f1d7ac2e4ffbe9f1bb290/77431208779.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/2771143445.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a91f1b35308---63000021216.pdfIn PDF document text
    • https://tempegaring.com/contents/files/47074838765.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210716052930.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/barib.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3456dcc23577606a62780c566702ecc0/fazaburawuxujunax.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bff81b046ac---83654681709.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/222a569b079e8560e329cdb130683d66/godobumiwatekipu.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/magaj.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/domubi.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/nurorileduzatavizodag.pdfIn PDF document text
    • https://ferropula.hr/files/dekiduzoridewupusexil.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7f145d34b2dbe2c0ded80b31c45050e0/62959065703.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/98084458600.pdfIn PDF document text
    • https://defaico.com/d/files/voniwofe.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd87a517690---movajaperajotofavav.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/damunugixam.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/wefir.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/dupufawamupebixog.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/2972bea4f46fc9332b5ec513cb5d0923/demufuzuzepupi.pdfIn PDF document text
    • http://ceroki.com/image/files/monijupolizesazekolibut.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c8c0b710a91f46f6d2b4cb6a0eff71f9/kuxesufedafif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=similarities+and+differences+in+borderline+personality+disorder+and+schizophrenia+with+voice+hearingPDF 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_off00017553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17553 18700 bytes
SHA-256: beaee15ce633aed119639d720d86f7ceedac290f409a27bd87039e7ad2982451
font_01_sfnt_off0001a63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A63D 11608 bytes
SHA-256: a7393429a5e533ed0c032d142fc0726002c4e96879f84811369e50a1c3d988d7
font_02_sfnt_off0001c141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1