Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2e32a5051cc479…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 01:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2fb335345a2ee8a3ffb1e28618b70b6 SHA-1: 6dd821316676e4e26b4ff75944adc7ff9edf44a9 SHA-256: db2e32a5051cc4794d87f2ce3e951222148d11789b6a34e38928afaca51f6c41
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to compromised CMS upload directories on multiple distinct hosts. These links are likely designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075df628ab1a---subitapi.pdf
    • https://cplastik.cz/data/cms/file/2112889382.pdf
    • http://taskentcompany.com/userfiles/file/42543511047.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/t6gqje7p88b3ofisrqlm6i0obt/pubujejibiwagijig.pdf
    • http://sinhorelli.com/userfiles/file/11891837745.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e71ad8a069---berezowavaxe.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe3405932c5---wufozopisova.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c0af251ade0107497df7a0656ee64cc5/mekidaleziw.pdf
    • http://infinity-pro.ru/userfiles/file/japipudavejezetu.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/fazedajul.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/tulubuziwizegiwovol.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f288315dd---ledigulinawewanevixinoruw.pdf
    • http://reicar.dk/userfiles/file/nodero.pdf
    • http://alkanboya.com/files/file///22925658007.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/nuvatubapojowevaxi.pdf
    • https://baxsporthorses.nl/userfiles/file/joxofesexuxenewawetupesul.pdf
    • https://suksesunited.com/contents//files/kupagufukifug.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/fs5knmmgd8jvr522sr0rjjtj74/pajowekotobeg.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/logogapepija.pdf
    • http://say-international.eu/userfiles/file/mapuvukomifopopoxa.pdf
    • https://fentesmakina.com/paket/upload/files/zanerutosogorimafajojo.pdf
    • http://tlproduct.com/userfiles/file/rumexomiveje.pdf
    • https://vildmarksjagt.dk/userfiles/file/tokudojawumedag.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/86952644726.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/momebelirasujijaraxezas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=taylor+swift+first+song
    • 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_off0000e67c.bin
1fd4b1fb0565df326031fbebe9a9f8e6ac95a23d215cbd73fa202c9a5b13bb55
pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 18840 bytes
font_01_sfnt_off00011767.bin
423f85a6d4d046798259c1e2759b3828553537995d45bce38bcd75a65df85ec7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11767 10420 bytes
font_02_sfnt_off00012f3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 16792 bytes