Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a4b8c1ef92a652…

MALICIOUS

PDF

71.0 KB Created: 2021-06-18 13:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 461c9fc2190f9be686ba9fa3f609584d SHA-1: 3dac6561b34a2c709231d83d4b65b7a47d210151 SHA-256: 87a4b8c1ef92a652146f8f9c15ccfa7b086e1ae55931c38ee05902ab8fe024b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=easy+mehndi+designs+full+hand+images PDF link annotation
    • http://chanakyaaerospacedefence.com/userfiles/file/modapu.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/85764495881.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/34686048790.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c8650391898---41498593176.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/33c5c1aa70a337bd7e60a1299eea3bb8/guranijajufufigepo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/gelofafobogonukumu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad6204850---nedaki.pdfIn PDF document text
    • https://unosms.us/userfiles/file/jirobanovizeru.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/36c7dadc5c1dca3002737d22b79f1304/jenoralofemoludexokokuk.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/31033373006.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/tuxebe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/af3000tsnd2tv3p66d65s2lobd/sabirub.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/jan1tdll4p70i03f0fiha0ps75/jigotorimiwi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eed87ebe3a7896b94d9fb656627e72f7/1241776509.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 5284 bytes
SHA-256: d0176153998d24fd5ea1a99adcddc1009c27c7572e7bd4938104d66bf303d58c
font_01_sfnt_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 10644 bytes
SHA-256: 8d8745f5ec76ea19d3a62d6f426148152fd39535a9542cec51b37dc3c4cfd582

Open this report in the interactive analyzer, or submit your own file for analysis.