Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58c06ef86d9a686…

MALICIOUS

PDF

80.4 KB Created: 2021-08-20 23:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08edabd8d91cfda0876f56622faa365a SHA-1: 69dc77a7bc5a45801a9a388662b8477d881424c2 SHA-256: f58c06ef86d9a686d275f37f07fabb31bd3df129f853b9cad0b5c229b0ad8f7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://udmvdpo.ru/images/files/78832820628.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2def0433af7294e73af86db66d0882be/zanowixodewerutotovadanuw.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/89824639571.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fec13dacd---17400558092.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/zofaladuregorones.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/91123720998.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/0e7leoh5qihmb7q5p3sngh2fe2/dorojusanekinuwupazamuvu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d481af335---59745561019.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/50850474489.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/45759475394.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/90614905782.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/temeviwetarefude.pdfIn PDF document text
    • http://naucseto.cz/storage/pefixitogujadibinutize.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/90280253610.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/8118805717.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cof3g8jr4h70jsiivf6fpa9vgc/sanufasa.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/xituzizatubesetakapologo.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/zujagezusojifo.pdfIn PDF document text
    • http://kalikraft.com/images/file/gamuxowupunib.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/tujemuxadovelugugezojebe.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/mexaxozolu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/oggi98e7st93j1mjob016vp1bl/wozufitudozoxi.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/68761545505.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a3b1ac05609706933d1ccaf50b548a76/rinafepom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=drinks+to+make+with+crown+royal+green+applePDF 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_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 11116 bytes
SHA-256: 9d4c214b6ab79a88da53d42d0c04733d9e2950f0cd301151a846665f8aab509a
font_01_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 17184 bytes
SHA-256: 6bdd99bc083ec069dac8bef2e32537afcd3d21d7cac586aec60fe1e8dfee57dc
font_02_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1