Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c46a1e437dc47f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 17:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a761f05cea484842ecbb988b7ec2807 SHA-1: 5dfca0b69940f0b2e9f2053eb46a6aff8601e957 SHA-256: 69c46a1e437dc47f9eb94a1cb4261c70fe73a054712bf00a2def407c03783a2b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.dilipprabhavalkar.com/images/file/telobax.pdf In PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/96965945944.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138551d6cdc3---54209237892.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/72541905882.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/53235ecd236d8dbde1697b4113c00957/dupuvuruxuwekav.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/kijerufutebadiduxade.pdfIn PDF document text
    • http://sooclose.eu/upload/File/bizubuzokuxonibefuvegu.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/zapotoke.pdfIn PDF document text
    • https://777mto.com/contents/files/solonuzefiveze.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/26882383629.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/kekekililukusogamituwe.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/56684416983.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/76529398473.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/78698076968.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/82513de0aa5b6c3596344c657ba2f571/77488497991.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/gufomi.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/ropubenujufimevekibagun.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/74705160243.pdfIn PDF document text
    • http://huntland.hu/upload/file/67381657068.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/rujegijasigokisoruwev.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/40894886438.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202191747549343.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/vowilonexenadizoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=adrenal+tumors+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_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 16992 bytes
SHA-256: 21999f445451abe1be6b75dff2539f6b0c49a4fb18478c00405a047c02429dd7
font_01_sfnt_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 10648 bytes
SHA-256: 870cadb9d5e15e4ebfcb627b5b9af369ad45f9211170fde7fc4bd715deef3210
font_02_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1