Malicious PDF — malware analysis report

Static analysis result for SHA-256 c422854c3c9ae7f0…

MALICIOUS

PDF

107.5 KB Created: 2021-07-02 23:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: aaf9e87ae86fde923a2a8c3eadd68359 SHA-1: f2f96a78a96d512e6f0924aa4564ece25a715cdf SHA-256: c422854c3c9ae7f09ca134e8e369d5ea31d84da25b291f19f213a91312620580
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=how+to+give+knockback+1000 PDF link annotation
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e92d87fa7---20550432210.pdfIn PDF document text
    • https://protrialse.eu/files/files/dakamudubu.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/repegibomipasepowazur.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acdec29a403---jakojuwip.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/ligapidaketejipitelenu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b983a2c609---25280019438.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/62701813045.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/u3p3jthgmqcdvji7mmduofstr2/80743593041.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/xukedogot.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b57a52bf8---47098609729.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/2729292577.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/nugurep.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zumezikexob.pdfIn PDF document text
    • http://learningkey.org/userfiles/jemok.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/55919738995.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/21275411250.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/nejemizijotasezoniv.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a325afc6e91---2511085323.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc9d7ec53c---49308040360.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0d1ad8e1---20912607772.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/d70dea715e57cda4c57fa8b47bcbd7b3/juguzo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb6fb18dc---21582114656.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609609563f2a0---43524338862.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001275c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 27680 bytes
SHA-256: ecb5436ff833fdeec9bd3f68b8744d48e83ea55f1ed2514b5ff45be37c686ed6
font_01_sfnt_off000164c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C1 2536 bytes
SHA-256: 41ab67463d203976f0f910e192ebb5d4e761cd4931de0085f1f2ffbef839e1d9
font_02_sfnt_off00016fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000187d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187D7 10640 bytes
SHA-256: 67db1028ea2e2fe9c63025866c62acf80c8b4cd409123147e853b054c4cc1fbe

Open this report in the interactive analyzer, or submit your own file for analysis.