Malicious PDF — malware analysis report

Static analysis result for SHA-256 740c52396253d190…

MALICIOUS

PDF

91.1 KB Created: 2021-09-19 12:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4b477a17177980f50ff6a8f2d3b2dd3 SHA-1: 693295f9267b5c111ffb0b68390e49786599c01c SHA-256: 740c52396253d19044d39070c4486bd3d3b42e45e9a46c0395bb3fe62896cea3
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable or compromised hosting domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself is minimal, with the primary function appearing to be the hosting and distribution of these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://alisawedding.com/upload/users/files/93854828621.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/015937d0c9fb3477fb2eb98566f822fc/wowulibizadelowugukile.pdfIn PDF document text
    • http://akademibt.com/resimler/files/10986254558.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/7709100886.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/35699548723.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/85978520725.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/5475861090.pdfIn PDF document text
    • https://tl-systems.hu/files/files/11698870436.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/dijagilazinase.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/goniwugenapinokubagex.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/23532794365.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303234c0ba0---91155804609.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/49548734221.pdfIn PDF document text
    • http://apcmagon.com/userfiles/wenixidevewimuvig.pdfIn PDF document text
    • http://1carl.com/userfiles/file/dopatibi.pdfIn PDF document text
    • http://aimic.com/userfiles/file/damiwunepulureserarura.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/256ac129f268a4fa17af88da9f29b557/44514645790.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/18052702505.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/mobosewojirerav.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/41128682193.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/25205333457.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41acd3981---46708654050.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/zeromagibikotudanogu.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/13671622686147041c2b1ac.pdfIn PDF document text
    • http://st03.it/userfiles/files/wudogirufipa.pdfIn PDF document text
    • https://virker-ikke.dk/files/93879470086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sonic+the+hedgehog+2PDF 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_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 17992 bytes
SHA-256: 0b2bcc23b7a4d43d0448364f8ab4315bc46703931ddce1f488ebb842967bf118
font_01_sfnt_off00012f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8F 10368 bytes
SHA-256: 799d17b3bbb5771445f0eb55920114bfd53bb5e8c228519b808f7bf964e1f393
font_02_sfnt_off000146c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1