Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d658ddac2cab93e…

MALICIOUS

PDF

86.2 KB Created: 2021-08-21 08:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c65c8c262620c8f4831014bd323bcc1 SHA-1: ab82078f5ec8a0361f420cd1d1a5e7e80e774c2f SHA-256: 0d658ddac2cab93e76af3fe63c674bc788ada5c63a29d5c422b1916b8234ec32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files hosted on compromised websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using link farms on potentially untrusted or compromised hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://polletnv.be/uploads/files/wugofijovagofulu.pdf In PDF document text
    • https://pmms-online.com/assets/file/xofaruzipeweteparibigive.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf97d730b6---85534676761.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/bitogotasalajekoz.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/18171562709.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/wekize.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/metuzunozanazorabawa.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160809362a530f---27745985373.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-24/20210624003144353819.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f77b53391b3---fasilazojixomonoxur.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1vpibudh6r9pcldtvsad4hvaf1/66434969185.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/tivemupizalivedemawed.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/puvederupax.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/96892767651.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/22409379033.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/jelulede.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/2ta1rb2km7o2jfb3ku7orcvjm1/86080993391.pdfIn PDF document text
    • http://remobudostol.pl/pliki/62478265712.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/65038435043.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210719_E900A0F0A051CDF4.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0545010c5---48722900100.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/62160002490.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4718dc799c---xesanefede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=debt+collection+company+near+mePDF 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_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 10624 bytes
SHA-256: 2ba32ab071f7772871eaa410c17ec061f14d8c84432faeb60b7973d1b2bb851f
font_02_sfnt_off00011e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 17288 bytes
SHA-256: 7d66c50191ff82af676c1432c75e785b181889e1b21fe53a82d6a2cc354f9a7f

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