Malicious PDF — malware analysis report

Static analysis result for SHA-256 5911a43943e43d68…

MALICIOUS

PDF

83.8 KB Created: 2021-08-30 11:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7664ed3607902f39e9afb7641ffd65b6 SHA-1: 6bc09109bb010202ae57617954a1ce69ca1400db SHA-256: 5911a43943e43d6872bdb458ea19c7dc9c253b2f5dba382e4ab42136237aeefa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drafthe.ru/uplcv?utm_term=a+man+getting+into+the+compartment+stammered+an+apology+split PDF link annotation
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/69d6261103f59b6cd61ef34e3826c9d7/dekoru.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761af4d00d8---vitelixomalobowu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf707a15b---xavijonatutosatabul.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/jadanuwiwororivamakimeguk.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3e2ca42b---43785125330.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/61801128133.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/jisogowebujukigifeki.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/91797748256.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a54804c9232---37253971969.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/71aa772584a71c7e2349c02ff59bfb3b/21739016434.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b06927df12f---kuxebo.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/89055932925.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7a2ff3437e5ee256f7963a49b2533d64/3255609141.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1dfe5f835---57186815673.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/setebusafaretiponenot.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/bixoxofolesozulararevi.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/13719697554.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/nelorepuwukipezubilo.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/97b387422541e9ab6072e7cac0bcc971/neruzizutojukobuvekageli.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/41700865891.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/xesejivugumetapabufofo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/rqok6u6t3f3ehc988rand2n8k7/kizabuxuzi.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/belazuzumonawekisekode.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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 11056 bytes
SHA-256: f8aa5fa48c59c88d1aa23014c84cfbd99d9358022644d2ca5f0273c0f8662908
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 19152 bytes
SHA-256: 2ac4559be4ed41c09b52a7281151d1e3ba7e9f6a188732d391846f52e81761dc
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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