Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c678b8d6d7e68d…

MALICIOUS

PDF

96.0 KB Created: 2021-08-26 10:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 03bcbe4d5e548899fc4de83dc6353548 SHA-1: 6823a8a86aed39ae60cf26b2abd2c711ee08554c SHA-256: b7c678b8d6d7e68d2295a3c1ee4b8be45f302a0780d09188ba26a6e89840e4d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a25ce87f185---puwizifowulal.pdf In PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/80713432671.pdfIn PDF document text
    • http://premium-h.info/files/files/87895109078.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/savedika.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/419288545.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/zabutufipezepazowa.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/19281664433.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/oeinbm8tq1a85pu3e606co5e07/rijunorogorelosuko.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80qkvesu1pulb9n4i58gid2mb2/93538987279.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113f2a629292---3916259377.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/37305651938.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/bc57ed0bd890df1e135414ca021b5914/48845261761.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/9iluavrolb8lk58ks5l5e5s0mh/57547606210.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/65da4666a0157f6a804780bca15c6dcc/13999191762.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/fi70fubjfqk8j3sdutidgaia3t/5425028602.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/28793297949.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/0425154b95325071abcabdf7c9509f43/25967024266.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/41004343852.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/22213548352.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160752b4480e1f---77455012179.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610482c2c4bbb---15469633763.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/sadafikugalurugul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=objective+on+resume+for+first+jobPDF 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_off000113e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF8 10748 bytes
SHA-256: 99c5ee724bf3429e5447811e2c1c3d95855fb871d8f51d805a1651e6e8bb5a42
font_02_sfnt_off000144b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B5 17156 bytes
SHA-256: bfb20622a746dff7a85f8ec353390594a70582951789e3ce8400e2d36e55dc73