Malicious PDF — malware analysis report

Static analysis result for SHA-256 3998dadad7a704a6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-03 04:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5654f69ffbde96d062826e4eb74455e SHA-1: de6197e704aca53e21f67e222a0984c0083dd26a SHA-256: 3998dadad7a704a60d7bbbf48f1d03f48af9d0d76c779548d733e7656a5b0c4e
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://theleadershipworks.com/PO2/UPFILE/userfiles/files/27881243472.pdf In PDF document text
    • https://blokhol.com/upload/files/veneji.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/wekodukepopas.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/84879239133.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/lejutesokukifotevi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7d8cf3333---pinilijole.pdfIn PDF document text
    • https://led7.ru/file/fawapetozuge.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/nuvudoresowaz.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cd9a636bf365e35b73f585dd82edeb63/lizelada.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160add46c14048---70710664287.pdfIn PDF document text
    • https://ubranni.com/uploader/files/57999216904.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/24cf0bf265b0118c2ef9bae0beebdb15/pufitoviteviwefi.pdfIn PDF document text
    • http://teplospectr.ru/images/files/bovipasafawi.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/76a942da8fd204723757a621af1009d3/53249192352.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/nt25kire3ganebs14r0rc9r6ue/32382340352.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/kizimepowepopitexajojus.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630173736.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/11923340604.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160daf98ac526d---baruwib.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02a51675f---51146816969.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210903_92508320D54FEF3B.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3c887e64---63749745598.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/71449293364.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/8503123358.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/31247180701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=personal+property+release+form+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_off0000beb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB6 10684 bytes
SHA-256: 1bf8dd2fe1b29e7de4d626db72817876a5ed4938efcd6a2a44a549091427134f
font_01_sfnt_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 16236 bytes
SHA-256: ccadc8ef54d215ca6f1991f088a55b6d1f39a2092ef8f87d3c2b9cb5e497dcfc
font_02_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1