Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5762684ea16fdbd…

MALICIOUS

PDF

69.6 KB Created: 2021-09-02 06:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba682ad1086457254e126d52b6de038e SHA-1: 9278b882b2236b6fcabb68a532cb57207cec0126 SHA-256: a5762684ea16fdbd59c0a45f626c76c185050676f8d78e05c435f1093bec4515
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The document's structure, with minimal text and a large image, supports the 'screenshot lure' heuristic, indicating a deceptive user interface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1168cc6088---19531759898.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ud65fomg1n7gst3i8qoffrkep1/dirafisiban.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/binubofanazulok.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/8efb5ae080170537d8902c15fd3a21e3/pijorixomabonunawer.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/qd7n5pbthna6bac9i8vv5r27h2/84001841840.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/meranuweroredi.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/62181684608.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/duxanoziwasotisol.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c5515eba---torakubefodononew.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/83330121596.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/31420647881.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa82aedc82---71082577214.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/36501c1fcbec4fdd478ca31bd608b00c/naxipavumevamuwigo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07f9b3dd63---wipuzaragevegexasapimabod.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/3111906770.pdfIn PDF document text
    • https://interconformity.ro/images/file/77860272910.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/48878521284.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8b60813e1b28139549251ee78b781142/75709244102.pdfIn PDF document text
    • http://rayanchem.com/d/files/40051152577.pdfIn PDF document text
    • http://merwepizza.com/upload/file/51345146442.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/51606154213.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/78141580460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=is+it+possible+to+unshrink+clothesPDF 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_off0000b44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44A 14632 bytes
SHA-256: 09cd2e4b2d863f57e6cb006a5c452707d1f7ca4d606a161eda255ad2592b2246
font_01_sfnt_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 10592 bytes
SHA-256: c1276a3ed01b448058f558a99f92efd62407af5051a0fabe401288c74ba38793
font_02_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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