Malicious PDF — malware analysis report

Static analysis result for SHA-256 6788337ca421382b…

MALICIOUS

PDF

147.2 KB Created: 2021-07-02 09:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 002212e33de238db1ffdf862b6d96c89 SHA-1: f608f17e0acb0a47a3b2c4d1a05315faef788687 SHA-256: 6788337ca421382b0b4643e3d3304b7d7ade39602cc2f70c5d1b4cb3f8964ff7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://synerhu.ru/uplcv?utm_term=understanding+financial+accounting+burnley+pdf PDF link annotation
    • http://live-lessons.net/lcj/web/uploads/assets/file/vibovu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c886e07335---93049530391.pdfIn PDF document text
    • https://nistd.in/userfiles/file/66484560852.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/8ks477nb6rnkd7q47dmv2e08vv/segavopelametosegevet.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/20212088686.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/42131615144.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/rumabegabedefogol.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/videtozas.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760385765d4---xefagufikufarisew.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/vitozuperamepas.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609236769ad03---vozotolekuzexusexewom.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc0dc6320---pifekevez.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/tizuzodot.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/72196259979.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f55be19d33---99429815175.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4cfe930a88ede6b81bfa673f033ee59d/radelilipomanedisobanot.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073150758eec---46942788151.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/aa34187c1597fa873603d5d57e5f95ed/zatakavelajejix.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/pafibizevulopopobifepu.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f00c9dff956d15e9a2bf7007842964ce/nodeg.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a613aec7443---relinudixivasagog.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/592b11918f7bb507644b100528478632/riwujupumufepopovuni.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/5528668458.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/dnuipdhpg6ppa2mcbba29l3534/womuxafipoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC1F 11156 bytes
SHA-256: 4b7f1ac1a28ec11c5101aef6d8ee5d9b7aabc6ef29fb3d98a7d4e304ace8e8c2
font_01_sfnt_off0001f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5EB 18464 bytes
SHA-256: b714d134c5d3994ca8728be01754cd39c7e93887dad404e8edd47824ed65ee22
font_02_sfnt_off000226a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x226A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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