Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e44edbeba00ddd…

MALICIOUS

PDF

82.9 KB Created: 2021-08-18 19:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5170247712cf383eb1e0024a1c93c36c SHA-1: 06111441ed26e30810d8f144af007fcc3e0d893e SHA-256: 79e44edbeba00ddde4d0aa4f01a850336ff2a00d7eff1ead412ca2da385d5aa0
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=what+does+the+bible+say+about+respecting+others PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a53ac8ac44f6b84c1fef398339506ec0/zimaravisoket.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2c7d7dde47f14d9a2b35ae1288df31a7/rulofonapi.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/96247737635.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/peluxo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d83348bbceb---99038987640.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/5111948646.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/90110550772.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/66284863102.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/somezo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/34116a8def79cb047673a6c9ededc732/49168921226.pdfIn PDF document text
    • http://anupbolivia.com/images/files/88629480891.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6ac30cc14ee0a4550e25afcca84db1d8/46594972911.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/46259355838.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/84662837173.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/46048477549.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3239db33b---33063587710.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/85117729809.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e025636ba2---82670940574.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/kakolifudegeboro.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/46634848242.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/69323793619.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/458afad436d11a9b5ef949eba88d6dc8/26752898388.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_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 16904 bytes
SHA-256: b1d8bdd0c2c1156b3efb14f5466763c1eee288c1f271b7d14e27ea7c7844e12f
font_02_sfnt_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 11140 bytes
SHA-256: 6b6a725c6f2a43fae6e7abd657881653ea1232b5973560458248e9375508b28a