Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f2510901d0d954…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 21:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d3d72ee35949b1d949627cfd6ab3c6c SHA-1: 5c61eb93f4db0118d58fda2a9be909e2d9ca95fc SHA-256: d5f2510901d0d95445c0fc659d94e3619f95ef1335384f0a6957ff7f06670139
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial gateway scanning. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tuzoltosagmihald.hu/userfiles/file/serofinukazolalawizemu.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/de3f33faf8b2bb73ec7b829ab60b8b3d/52326971992.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/70278424427.pdfIn PDF document text
    • https://heyratacademy.ir/file/jukabamejoletewuvefesevu.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/3326230991.pdfIn PDF document text
    • http://vladekoservis.ru/files/83609689791.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/wefisamuninonokuko.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d9d833e35---pepal.pdfIn PDF document text
    • http://nktrading.qa/file/files/83575140896.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b3b51cef8---juravipilov.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/47970749472.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/33994739271.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/tibimo.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/nifowoxe.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161326e61cf009---pisatimezapalebawonogeket.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/nosuninuwasomoxoxe.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/99121418912.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/gugafewaxifabawodi.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/17121571936.pdfIn PDF document text
    • http://njxinbell.com/upload/files/67692622582.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/jorogufifedorafaluba.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/kepiwipuloxesujesiresel.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/40263877250.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/jafetuzevomurulotegi.pdfIn PDF document text
    • http://emannsltd.com/userfiles/suketobolavavovadinem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+send+files+to+my+phone+from+computerPDF 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_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 17124 bytes
SHA-256: f253de36c504c2993c34b2769dbf5433cb65f67d3ff7f2dd00d60e21905e9667
font_02_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 11016 bytes
SHA-256: 069545b400a56c8d85c8e043871ed2b026d19aa25a848f22d661dc2629dd3f6d

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