Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf271f49a90e31c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 12:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 587400c8bd2cfa1f2f26a918e0e0ad34 SHA-1: f50d01a0fc1294597289118b207bd947f10ef998 SHA-256: edf271f49a90e31c8a28b9dda5f2df24677f3c5f11c1b4a1beccee9753bce002
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

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 http://soflocops.org/clients/83264/File/46731458571.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160710319e7844---voxotitibujodofakuki.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed5e3f402e---29416147163.pdf
    • http://mispuntossaga.com/campannas/file/taligexumadudujesulizexex.pdf
    • http://4seasonstours.in/userfiles/file/xupedu.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4dc8e2a1---66112467552.pdf
    • http://mega.kz/media/upload/files/nedewokererajiwodefudazim.pdf
    • http://kowel.com/ckfinder/userfiles/files/1623464540.pdf
    • https://amrapalispot.com/userfiles/file/xekogi.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a8f5fa22---nizufatagididipe.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160947aa9c21b1---67105715017.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083f38179afa---rixifivifunoxizukixu.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/233cb48ee35b208b39e0c87490f0985a/54064939397.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707e43c729---sulumenamaxigesadapav.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb2f064137---93629468686.pdf
    • https://eklyps.net/images/file/runijomawaridedigor.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bac4b936a---ravejawagigimobofe.pdf
    • https://svingenieria.cl/userfiles/file/nutazanivusolabode.pdf
    • https://senfina.top/uploads/files/pivaj.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/90569749980.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089cddb220ec---xenalaxilonaviloradomud.pdf
    • http://glovimex.com/uploads/ckfinder/files/dojixu.pdf
    • http://kuppersbusch-center.ru/uploads/files/40852729013.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/45419725746.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=functional+dyspepsia+pain
    • 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_off0000db43.bin
a866c64ae8ca3fdd32afa6180bf39be87fa1f5c36f79c8a9149ae4bf7da0549b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 17144 bytes
font_01_sfnt_off0001076b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 16792 bytes
font_02_sfnt_off00011f82.bin
f2cc082f17cfc3e7df6ed4a28f7818f98a321ece0ae0dd669ee9e59ea32f26ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 10600 bytes