Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5337ed10b08ba10…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 15:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: acf5d436fa2df77f0cf21839cc7646db SHA-1: 65a995efca4704eb2570244e2987af294d9a171f SHA-256: d5337ed10b08ba10fcf2accab4c82cb6a442de4fc58242056cb560a469628b86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs and a specific compromised CMS upload link suggests an attempt to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://exteractif.fr/pictures/2/nawizoxudefa.pdf In PDF document text
    • http://belovosushi.ru/files/98560979417.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/nejotobemopexol.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36333177696.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/zalepo.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/madipore.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/duridadukujagudilesesiso.pdfIn PDF document text
    • http://zeci.nl/im/image/zurizevod.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/vezoz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161501d9ba5036---kadewizajetusozi.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/30194569373.pdfIn PDF document text
    • http://vit-physio.de/file/rabivag.pdfIn PDF document text
    • http://herve-coiffure.ci/files/75287731835.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/67607486199.pdfIn PDF document text
    • http://alptw.com/images/files/gaxux.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091402011770554.pdfIn PDF document text
    • http://101balkon.ru/upload/files/48780866958.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/45137930115.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/sizemixupuz.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161387afe2a2f5---13567217960.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8a464bfe783d2622352ea8af3a4b9f9b/34065469779.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/75741536770.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/58603633122.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/deputinofipuj.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/49947327063.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/didoza.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/66032048973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=margamkali+songs+mp3+downloadPDF 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_off0000b3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E3 14908 bytes
SHA-256: 228b7cd95ecdbc7585b936e1727809a97a658f6b048c532a7732b8314884cdd9
font_01_sfnt_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 10848 bytes
SHA-256: 464d7540202425af2a5b33a1c154d5727378c7797e71b64e06d137d58b398138
font_02_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1