Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2bfe4929340419…

MALICIOUS

PDF

88.5 KB Created: 2021-07-28 05:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc6b9b270bfdec65c944248bb58d3e62 SHA-1: 9b9c9d359a67b66baab58df3c2c7ca331367390f SHA-256: de2bfe492934041906ccd1318316fdde2bab1ed143b05e49ff7ae29f2e877dd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware delivery campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://hirurgija.me//files/79755624857.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/8c2fa6eda8b3c015c30f06b7249261c8/45426656557.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/brqjo0kvq68o5lgq4uh173mod0/filemumisiwaxawixoviloda.pdf
    • http://vhshf.de/File/jozuxosowidiwidorobuxos.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160888df00cb9e---nukazetevisezixipaguleju.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/45503877105.pdf
    • http://tfforming.ru/d/files/54977016155.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4463f074e9c5f220ff6181e22e12f51/lonakaf.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/67478d2d046b11c43f9363227f18b75e/55835884592.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aae163165ce---gevozob.pdf
    • https://hmanagement.net/userfiles/file/nafamez.pdf
    • http://mamaskitchenorder.com/uploads/files/jifogi.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c585e356a---62143165606.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c20e16dc1429a223234288b34d901f23/ramovifel.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/77863379ac2166f85a8196c6ab4cbfc5/kanefaxuwurebugafowosasa.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb1911bfd---26936103956.pdf
    • http://monkey-do.net/userfiles/file/53731553877.pdf
    • http://clarksville.net/wysiwygfiles/file/22844834145.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/prmjts8mfva0fjnadf24d38nt3/40635549788.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc5f816187---18423407688.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/suu7ia7io5ov5npng2uatua94j/jures.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7e7f26f99656e83eaa9f8fa80161eb58/xegowelu.pdf
    • http://akinmedikal.com/uploads/file/76167783057.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+do+you+find+upper+and+lower+bounds
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 16792 bytes
font_01_sfnt_off00010bf3.bin
a829b07a1f34ef885812de67707ebac3ec95333c81ffbbb35f92afde5750ba02
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 10824 bytes
font_02_sfnt_off000124c8.bin
de5462f574a243b4f9cebb5ed564442ed72f5b844364ee8d3682ca649c9b0179
pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 17608 bytes