Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db5088f13635ad6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-22 17:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d076f2e08da02091390655631449adb2 SHA-1: db47685fa381ef90596b5259822d7fe6c0db009d SHA-256: 2db5088f13635ad6a6c84074aede3b06a627c0862bf72b8e7ec69ab4ad447de4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://cavusofis.com/images_upload/files/tidodugiruvafedipisenel.pdf
    • http://locthanhroyal.com/upload/files/74350135806.pdf
    • https://onecre.com/images/content/files/vifovesifusosos.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210904_5F0C624D42BAFBCF.pdf
    • https://muzpony.de/obrazki/file/wutogowuriwuzaxubod.pdf
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/sewefigidapotelina.pdf
    • http://domki-kopalino.pl/pliki/21974482087.pdf
    • http://proxima-design.cz/files/file/69909830502.pdf
    • http://logicamail.it/draft/media/mebupaponuvufuxuwixipuvup.pdf
    • http://lblussana.it/images/file/filuxuxifukujo.pdf
    • https://saya.ro/app/webroot/files/userfiles/files/955745167.pdf
    • https://honghow.com/ckfinder/userfiles/files/88657716868.pdf
    • http://denis-lefebvre-services.com/fichiers/file/xewoxovorujokotubux.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/850feb4b2337dba19272118fd498979f/marexupi.pdf
    • http://citra.cl/userfiles/file/dojetaxikezoboxebivukopo.pdf
    • http://mextro.de/upload/files/resumuwewisotogome.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/35367123261.pdf
    • http://conomiya.com/images/uploadedimages/file/borobogodepemobogewaguv.pdf
    • http://christopherspubandgrille.com/userfiles/files/xinifivevamigu.pdf
    • http://metalzilemboeventi.com/userfiles/files/xipuzipotoxosusi.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161403190d7e75---vasajasezis.pdf
    • http://lor-rostov.su/userfiles/files/28183828170.pdf
    • https://mediaget.ru/userfiles/files/keledok.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309b8297e34---mijitetazosejerexesotigig.pdf
    • http://verzorgingsindex.nl/images/uploads/60403776948.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/83026837685.pdf
    • https://seeandhearbetter.ie/img/shop/contents/vetefodivodiwinorexejem.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+google+maps+navigation+api
    • 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_off0000c69c.bin
db5e1a521f3ffe2109996b5ad467fefc32cf12992dd23e35991cafe3ebe0ec0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC69C 10780 bytes
font_01_sfnt_off0000df40.bin
e729157d46204cb0ca2a8ffedd30b2efbe8fb65987458935b5afd9fefad64a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 17004 bytes
font_02_sfnt_off00010ace.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 16792 bytes