Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bf394a01153be3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 23:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81fc76bac11b34e8c50fe0ab30569c7c SHA-1: e810f152e898c2779abdc349c2bce1b55e9e9590 SHA-256: 26bf394a01153be3e36ec88ad0a62dc2d07ce66ed9b8f173f9a5cb0f596d86c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such link farms for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malware distribution attempt, likely delivered via spearphishing.

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 https://philabc.ru/uplcv?utm_term=swiftkey+app+download PDF link annotation
    • http://ipost.mn/ckfinder/userfiles/files/kupaxerex.pdfIn PDF document text
    • http://tochuchoinghi.org/files/58085560590.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b88992f18---jemalerelebunatonodivaj.pdfIn PDF document text
    • https://wsbtitan.com/images/file/nunakapugogubofeza.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/bugodukapumoxutedesop.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sezaxiwefimefedubovit.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/3168159240.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/voletisusevezoxitu.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/xopanuga.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/91203886504.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/23406814551.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/8904094386.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/nixup.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/125aa43869e3352656cba02a2bbd4be6/13278696356.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/tujuzevilimotazasikumubi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4f64a961145bcce74034791ac6bae383/kazulusafi.pdfIn PDF document text
    • http://philipsphotographystudio.com/zoxotiri.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109102034407402.pdfIn PDF document text
    • https://irantruck.ir/data/file/bepakelud.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/58240639864.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210912084413.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/57931762704.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/86618382523.pdfIn PDF document text
    • http://afro-safari.com/upload/files/rukudofamusasosinu.pdfIn PDF document text
    • 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_off0000d079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 17736 bytes
SHA-256: b2843f4e4352bbb482b350f97fea7adf666960e630084c7a1c2df5be9e6e0589
font_01_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 10592 bytes
SHA-256: 7da993378712485cba5272a0922f6bf6769ece286a0f9c9389f7b0e4e5c1b31a
font_02_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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