Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c667b83c86f5fae…

MALICIOUS

PDF

122.2 KB Created: 2021-09-07 20:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a906208a314b4a8d56ecb9c08b54518 SHA-1: dd07778a866fdd3991fc395fc457de99fe88d675 SHA-256: 0c667b83c86f5fae41b3137fcb4a7b885af46f0e5cdb0cecdd98f3f123d2714e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=ferdydurke+tekst+pdf+chomikuj PDF link annotation
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f54e6b09bd---81517011198.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1f12e2e28b190f8e2b0b0e684fe521b4/xepisegezujales.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7o3q4gru8v811vpd0gi36b4qsd/52229736929.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbe5ea1011---59414094204.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a61640a4aec---99052357224.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/sulovulefuluwawivu.pdfIn PDF document text
    • http://gibisch.info/files/files/tuwafuginavatune.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/mosemelugi.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/dapezeloso.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/88712310017.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fe72b34e0---butewa.pdfIn PDF document text
    • http://aweibel.com/Photo/file/kugigozetiribut.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/voxevusevekopijivinijapub.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hqnaqv45ieqooss8uk1fqvpc9m/kesexenixanujenatiliw.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f97008cd792---pitamajux.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/fuvinamejetaxo.pdfIn PDF document text
    • http://apcmagon.com/userfiles/29958007757.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/27936381995.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/97263820100.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d679e48b8805701130a17584ca2868d/xilivenuruxew.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/95880782321.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/miravulonajawoverofo.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/fufasubumugipikupik.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/kezusigi.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085cabae0c48---farutu.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_off000177a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177A1 18588 bytes
SHA-256: fd48abf1d50801db6e976bcce9b33a2f88e56e3403177606d42001489cd4278b
font_01_sfnt_off0001a718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF2F 10984 bytes
SHA-256: 6091576eacf401ed12f82afc878f2e3dd22b268862c50868fc59520d21760113

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