Malicious PDF — malware analysis report

Static analysis result for SHA-256 b459ff0b6e83ba3d…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 19:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 765be27e33e333897000427fbed04aa2 SHA-1: 6b77e9b4b26bab36bd87eecd6257daa7056210cc SHA-256: b459ff0b6e83ba3dbe01864bcdd2af0512efd13a1e5635c183347e405c7a86d6
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its structure, containing a single image and a click-outward action. It hosts a link farm pointing to multiple distinct hosts, many of which are compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pcparts.fr/ckfinder/userfiles/files/xenazex.pdf
    • http://dmkaudit.sk/101/upload/file/41330778257.pdf
    • https://valergences.fr/userfiles/file/welorusezojarisugirujuko.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/99182109624.pdf
    • http://magnanelli.com/userfiles/file/67982898574.pdf
    • http://constantemails.com/userfiles/file/1630975888sumukapisutitupikuwo.pdf
    • https://detectiveoffice.net/userfiles/file/fuwuzamazinamutobetoza.pdf
    • https://gites-les-bardots.com/userfiles/file/31656506467.pdf
    • https://www.ijmsir.com/ckfinder/userfiles/files/48756714580.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210904_DF6E4001B3E85EBA.pdf
    • http://4reality.cz/userfiles/files/34513837583.pdf
    • https://orrizon.ru/images/file/71793053570.pdf
    • http://boden.boj.se/uploads/userfiles/files/zukabuzimixonunukizusuzis.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/57731054317.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/08d6abe8035ac2632f27871a2c8f4af1/55743404626.pdf
    • http://robwalker.net/fckupload/file/6081203347.pdf
    • https://geya99.com/ckfinder/userfiles/files/penopagetitokavedam.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/lrvg4dsr2mnj76rqs9nc2gmfr9/gamabukavolujake.pdf
    • https://nurea.se/currency/userfiles/file/xusiruzovope.pdf
    • https://tunhuaduytan.com/upload/userfiles/files/gususafobunavag.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/97c14d0e8d071b07aab76103c204e775/xogodajerufanag.pdf
    • http://cosmoscm.com/contents/files/mevifagub.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/sovupinerane.pdf
    • http://sgrappresentanze.eu/userfiles/files/47960078644.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/bonogagigopuv.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/93952700292.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ice+age+3+full+movie+online
    • 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_off0000b236.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 16792 bytes
font_01_sfnt_off0000ca4d.bin
36e2f232c91b356741918ebd644074821f68304223f1617c39e987aea055f856
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4D 10604 bytes
font_02_sfnt_off0000e291.bin
005d5009ff298b39070fae01963830dfbecbb014e65dc61f26cd470b7af3d267
pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 13904 bytes