Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84e181d0a5652f9…

MALICIOUS

PDF

107.5 KB Created: 2021-09-07 21:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ed1d23a5c39f62eba959f86ad63c784 SHA-1: 50debb145aa8fc77bcc861be4c41f4405a27011b SHA-256: f84e181d0a5652f9e6b02f8ae8c49870f4532ea19b9a8b20fb58d115d70aca8c
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or suspicious domains. The ML classifier also strongly suggests maliciousness, supporting the phishing and potential exploitation vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://fo-prefectures.com/pages/files/jasekitovuf.pdf In PDF document text
    • https://riondene.ch/img/uploads/file/wuruvedorinijewon.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ac24fc35bd79288bb7a4c7d2b03e9cf5/13614335323.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/xijebamijaja.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/pofovokasujitonifa.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lqj4ua18r7pg82mhtpaqgee1s3/36020257610.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/fewadoxojesonopatixi.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/kovmqhpoe4qo25o06l0ph8rnc7/pibatisalefoxake.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/jukalozesurixukosutimagep.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/belibi.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/h68cuj3biah7bgmqp0usj5vagb/1064119470.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946dfc02f26---44111156857.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/32656486991.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/topusenowiw.pdfIn PDF document text
    • https://norservis.com/files/files/67887596875.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c7d9c2c7da9618d72f21a800a25fbea8/wezamubulo.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/97523177331.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/fifedalibiguxagiwiz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b6564068c---diziruwogasokin.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/77657647257.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573dd58aee---linojagetopegolijesanu.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/wuzizobosojaferoxinawode.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/94108552443.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/69250833763.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/donagiji.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c52d272b9490f04f7d9c1d956c016a5c/66469532702.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/90033554484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=international+convention+against+torture+pdfPDF 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_off0001400e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400E 18032 bytes
SHA-256: d2a11206cf3487809a0f687fb3c4c97ed63b30f1a2c9b0fbb86283fae9be64cc
font_01_sfnt_off00016eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EED 10912 bytes
SHA-256: a02593cae2797fad822fe85fba2057b5c5709fc4af37ccef573c53ad01d69a45
font_02_sfnt_off0001881f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1881F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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