Malicious PDF — malware analysis report

Static analysis result for SHA-256 340a88b07a0113be…

MALICIOUS

PDF

66.7 KB Created: 2021-06-18 02:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ebcafa0bcfe42a937fc31ae153e56c2f SHA-1: fc378907225ff9d41d0cfb08d1b8d32ef5c3ad12 SHA-256: 340a88b07a0113be32f0d505f9465775c9239f036abc937643139bbd725f7236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as drafthe.ru and atdawnwelift.com. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=black+mature+asses PDF link annotation
    • http://atdawnwelift.com/userfiles/file/winobuj.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/ponola.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/s4sancsotrvg3pjb1fa98vttp9/zufoxazuxuji.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ub54psr8dfd2jhmv7tgb8m5i57/siropuwejusuwazed.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/donasonaxuvujadowod.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/82490111521.pdfIn PDF document text
    • http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/47728932686.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/75179118264.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/fib5in9d98r2phk02olfiakpc1/81201975286.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160752252c381f---nizubiz.pdfIn PDF document text
    • http://kbchina.de/upload/vurosadato.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/molodokoduxobolaged.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/59359339871.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/mefanedupe.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a75387f1151---kafovalugavitevuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000b491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB491 5056 bytes
SHA-256: be9544170313b6527d088f5419d88e6fcdc0cdd72bcc64ea77e0bcd0df30f074
font_01_sfnt_off0000c5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A8 10112 bytes
SHA-256: 8f02ef2ccc8436ae0cae5705f31b0a9f3ecefc8a8bca3f210bf1036e6efb9790
font_02_sfnt_off0000e865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 16316 bytes
SHA-256: 54f7f0dcede084e84006ac1bc8d63bc27d6dc7cf252cfcd545820bab46cc9e38