Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c297a4bf81d930…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 22:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee91aad2ca20134ec3d98aba3f0d26a2 SHA-1: 850bc273c73ef1b21bd9e46265ab6b6a4af0f7c2 SHA-256: d8c297a4bf81d93026abf2c0b23e273f9fa1eb0fb10a0c6d7f1874e8de391a2b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://elsped.hu/files/file/zufosujitibe.pdf In PDF document text
    • http://frchem.cn/upload/files/fifukepavulirorenaxupomab.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d904930bc722fb8be02934c53905f06e/29414603871.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/nunebalatuxi.pdfIn PDF document text
    • http://entrackintl.com/uploads/11285035024.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/83545005825.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/74095953486.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/69821723804.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b73e05052a6f4fb016d89d04d10fd8bf/girofufubafo.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/bepef.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/4981549074.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/89809622226.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/46455527279.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/62963471392.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/eb6gmkcf31o698uve5ashq50o8/49175656498.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134b07fee516---69694683654.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d3d15db3---12979515566.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132e63b6c8df---midinopa.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/sorurefibafisotab.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/33430045760.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210910214437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=which+phone+is+better+iphone+or+androidPDF 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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 17632 bytes
SHA-256: 9649df5071c46a812feba8e13c6e0a95dc7e3db6bb2c1921aeda656d6a6f2a58
font_01_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 10700 bytes
SHA-256: 7922e5e8b09ef50b4da12d8bbc812a3d91836d136123f9609862964e26be35f2
font_02_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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