Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2c941a01421faa…

MALICIOUS

PDF

81.9 KB Created: 2021-08-25 03:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: de1a9daf66b1298853aa0f59fa33e65c SHA-1: bd043621fe39e434d3e16be402937521331fa040 SHA-256: 6d2c941a01421faadc5cd03bbf8d5b34f17d23e37cf91c220abfa4edbdb8efb4
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external domains, many of which are hosted on compromised CMS platforms or disposable hosting. This pattern is commonly used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://pc-driver.ru/userfiles/files/3219197516.pdf In PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/zovisejozidagojodi.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/49254530229.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/81369285705.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/j6do4q379dl31rtavmeu2m2298/91605638099.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/minapaluwaso.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/mizedo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612192f101d17---savetisogexis.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/cb586183ac650d872dc790559952990b/mojujosu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d16e0315---4350842361.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/cij8tdfl50cldu5bke2pfr1h7o/tanipalavetav.pdfIn PDF document text
    • https://marosme.ro/hirek/file/10062956239.pdfIn PDF document text
    • https://digireg.cz/upload/wugufojexinugudolazig.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/22b4dce086b0e9efc5f6a12bd7a48227/nebebavamejikosawa.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/vizavod.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/zexolakin.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0545ce1eb1ddc9e45c3c8b0a798f9326/radepozuzopasofipug.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/wemipuzawuxofarugizup.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/lufojibajarerun.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/wiguzixodet.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b612067bb---12391759672.pdfIn PDF document text
    • http://linker-apps.com/files/xatunifapinilodafa.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202108200254_848819014.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/2rnis6s217k3u72hejkbk2k1fa/nuxetupowarenebitiwadib.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160827d466d584---fewuletexuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=neon+protons+neutrons+electronsPDF link annotation
    • 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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 16932 bytes
SHA-256: 192133e13f3558d65aecc532434e524f84bacf0b86368a4fffcf2cb675be2d2b
font_02_sfnt_off000122f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 10188 bytes
SHA-256: 194a5a1c3cefa5c79771ae13011990613ea3c784511f5230c3f27df735c26990