Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c75119da64dbac…

MALICIOUS

PDF

106.4 KB Created: 2021-07-05 01:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a1819f161035d9a7e08c695b072d6d5 SHA-1: c8b93acd4c248d2b5e842b887ee1882c59c82055 SHA-256: a6c75119da64dbac63a6fa33b235bf73bdf714c3d05021f130c7ee0f84af9c34
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The presence of a link farm with numerous external URLs, many hosted on compromised WordPress sites or disposable domains, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=union+special+81200+manual
    • http://alfavit.tv/userfiles/file/gowivifelorimaguloz.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/46659586429.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8fad2a554---nevavunidegiw.pdf
    • http://yuha.be/_files/file/dexojevilijepevid.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ae1449d66e78f3690e32c2d83b84789f/bireliserow.pdf
    • http://bigband-ulm.de/userfiles/files/83111039270.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954f59e6175---82058263091.pdf
    • http://eperon-kochersberg.com/img_db/64884478249.pdf
    • https://aawyx.com/sites/default/imageuser/file/surixa.pdf
    • https://hophamthaibinh.com/upload/files/32173556984.pdf
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/96980493551.pdf
    • http://robalton.es/Albums/images/file///51462261718.pdf
    • http://easyreturn.store/userfiles/file/29686359326.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af9483b646a---videwowodulepejepuma.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fd441c63d79aaec7ddc4cbbc1abc8a28/durototonotumaxelopi.pdf
    • http://thessalonikiflights.com/files/files/86923204233.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/7589971354.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eb425410---15436891992.pdf
    • http://aexpress.lv/index/images/up/file/garowagobu.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lfcm39lp7q7uor6nooo0u7acpt/38427280035.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c096aadf2cb---zarimugejorox.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7969cbf9---77066599445.pdf
    • http://topas.lt/userfiles/file/takotigeropike.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608251fa23be7---48355886065.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_off000135ef.bin
76db2e2859bf2b7c6c958806ec5fc2d8b0601838e0897f3a4a5c6966cc064a4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x135EF 20308 bytes
font_01_sfnt_off000168ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x168FF 16792 bytes
font_02_sfnt_off00018116.bin
6bd65fc4b22b6cfdf998a5547badc5c154e14bc6f8151ea12b333aef91bc60da
pdf-font-stream PDF embedded font (sfnt) at offset 0x18116 10948 bytes