Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03caf423d569a2d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 01:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cfeef1b5b889320301e6a678c9d0840 SHA-1: 555a2f4d5d45b49c90063042b03fb84855ce4ddb SHA-256: a03caf423d569a2d4aa273961a15e2697c1dfc241423347442f936de4a4cdd34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of a Google feedproxy URL with a 'gta san andreas android download' term indicates a lure to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edefe6e343---wodotikalofizaparugadut.pdf
    • https://foodthings.us/userfiles/file/39614740239.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/kezibenim.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/88913271391.pdf
    • https://dennismaloney.ca/upload/editor/file/fosojufasowedoxojekaveze.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4bbf47c26---74091761559.pdf
    • http://optykglowacki.pl/obrazki/files/92979850307.pdf
    • https://lanhcongnghiepthinhphat.com/upload/files/94257807856.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614272acc2963---39651898992.pdf
    • http://naturpix.ch/cmsimages/file/8928334705.pdf
    • http://perlawarmii.pl/userfiles/file/57292951017.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/vivixewekosow.pdf
    • http://baltyk.recykling-rejs.pl/imgturysta/files/29086572687.pdf
    • https://shturnev.com/files/foFKED/file/7142645150.pdf
    • http://bellina.pl/userfiles/file/75759390644.pdf
    • http://deeringbayrealestate.com/userfiles/files/60030503050.pdf
    • https://valeaflorilor.ro/img/uploads/file/1204740680.pdf
    • https://sukhayurveda.in/userfiles/file/3266639974.pdf
    • http://zaintik.org/files/galeria/files/24920291927.pdf
    • http://studiolorenzoni.eu/userfiles/files/reneneraxata.pdf
    • http://preciz.com/uploads/wysiwyg/files/bogegegureluja.pdf
    • http://celcg.pl/uploaded/file/dojanirebofimiparos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gta+san+andreas+android+download+2020
    • 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_off0000b0fe.bin
e834036336c2f32fe98f54c2009be1022bdd83b3b3b6548dfc25f06576032273
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FE 14668 bytes
font_01_sfnt_off0000d5c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 16792 bytes
font_02_sfnt_off0000edd9.bin
0eeba7a165c8a6961a66a4c8f14a78bec761c1197359115c14d8ce6bfdccc88a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 10608 bytes