Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b9ef3526f46ac9…

MALICIOUS

PDF

84.3 KB Created: 2021-06-25 15:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79ec2242e41cc626063f5b66ff40325b SHA-1: 8e044c6f242157a73723953eb0284820190f0358 SHA-256: 91b9ef3526f46ac9348887d543ccd6ed7d65d63dbb62bc6df38d8766d03e69c9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=how+to+make+a+pane+of+glass+in+minecraft
    • https://la-klamm.org/userfiles/file/59607406224.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc36d2a31---85680717575.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608391fe5dfd7---81570284461.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/zoderadimebelefoli.pdf
    • http://topcudental.com/img/userfiles/files/90579594048.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e170bfada9127d8e6ce7507d7b2edc0/futiponewiziler.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0b379179d1cec37168ef6b19ef812935/kigadonanufelawosubidok.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7145414865---14712402305.pdf
    • http://ngocvietbungalow.com/upload/files/zaruwifanigagu.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/xoduxiripujutek.pdf
    • https://emauto.lv/index/images/up/file/89581461612.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/5458eb44e4f7d122f71bc2d7f3e6aa6a/gowerobeg.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/7b0563d032b0f2a8160853992fd31849/litarivova.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1b97861f---93929652669.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab889eb4b36---61204000828.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e441.bin
8f6bf3dfacc6929dc1c4b13499b8f1834902f6974dfb9a7def2cf7fd488efd79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 17996 bytes
font_01_sfnt_off00011297.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 16792 bytes
font_02_sfnt_off00012aae.bin
7ba6f035373223097bb45b2bc90d525ebeccefa17d17d85269d22a615b58d153		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAE 10992 bytes

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