Malicious PDF — malware analysis report

Static analysis result for SHA-256 af841775a36f9d33…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 05:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26422ca56e1fe133951e2dc7598e5d06 SHA-1: 110c9a000536c478403e764da24b41869d372aa5 SHA-256: af841775a36f9d333e186de491c36830969666ef24aa5929e45d9f85e275eec6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for containing link farms on disposable hosting, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=quadratic+functions+and+graphs PDF link annotation
    • http://senvietsystem.com/ckeditor/upload/files/21784361971.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/17417579273.pdfIn PDF document text
    • https://topupdana.com/contents/files/82172615588.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/vufiwezinavupaladi.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/pagugiwelotepizokita.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0bdb4547---62063352660.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/15463817378.pdfIn PDF document text
    • https://limsurdua.com/contents/files/xinumuza.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/67062097248.pdfIn PDF document text
    • http://peoplefoster.com/pliki/60965183364.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/jatisodir.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/pijujigikonadurafut.pdfIn PDF document text
    • http://splogservice.ru/content/files/18177835060.pdfIn PDF document text
    • http://packturf.fr/files/kipumikewitonabiwojilopis.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/rejarapanagixedimapuvo.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/41872339197.pdfIn PDF document text
    • http://langyupharm.com/upload/files/bofunevinawejukefoketuku.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1472a2bd---luguluw.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5e4665a1---mulumukozir.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/pevurovuwuvow.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/35465658435.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/52860482927.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/95177970270.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318dd7b39c5---51546831899.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210910021057.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_off0000c127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC127 10880 bytes
SHA-256: 67ae038cf98da79c8c90ece6069dfb902b05645998ad43203c6f2e04c4d9296e
font_01_sfnt_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 16760 bytes
SHA-256: 0ff394b9e97e4a6bb529e42f860c977fd7759c0e5cf7425052199bb4c6d51f5a

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