Malicious PDF — malware analysis report

Static analysis result for SHA-256 893cceed06857030…

MALICIOUS

PDF

85.7 KB Created: 2021-07-02 20:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 869e668fd3a5d4425c78675421b28d66 SHA-1: f4dce2c82e361a860841b31536d549ec17398c3b SHA-256: 893cceed0685703003999aabb577d5179da00a039da328b7b683310300e1e303
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://krisoc.ru/uplcv?utm_term=formula+to+find+slope+of+straight+line PDF link annotation
    • https://caribemed.com/userfiles/file/8159926275.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/69841560528.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c4468288f---misodefob.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hbsk9apuieecu0l989r7jm5ar1/pebitatifokex.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/284fe3cf68260469f5723163262aff8a/tinufizenasevezudutorizo.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/xadagamuwako.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/wupujipinanemi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b7a1b35f---34097234310.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/gexojovujovixaxojipodoro.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c34acd6d73f64f04dcf4a2fa1c8289a6/fivifazekogalexukoj.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c1fec383c3ba53e9edae6416458baad4/79040548594.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4ce3e6220---sewujaxonedigaluw.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ctvb26dqnch6f04hprssedqdb9/6640101582.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f572447b---32214695319.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f868502dc8---73761586614.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c380df0dd1a---zowuwukodubatikokopi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a62f6f2329789b8abd11f1fbc72bc8e1/pololiladafotupij.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/10107309205.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/n34bsdhr3108h94qpkgjp4q1h2/tamosutuwiteturexef.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/01628a00d7038e322ac1a26a94fd12c6/nokofilabusugex.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021060917430378.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080c6b3d403f---84065694101.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 11020 bytes
SHA-256: 717e2b80c9c3f034698eb2bbf2c7dc343a07e5f9f3b1bb79c3e34ba0bf6ab11e
font_01_sfnt_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 16320 bytes
SHA-256: 281a8e0f5d6ff93c8b68c010f229fb6ad7bb76303726e8bceb98a17be6b52fdc
font_02_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 17304 bytes
SHA-256: 0a80605f56b8cc4fa15f2f1ece2825d7ba9573d910b3ce76abbe1fcfb6642e71

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