Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b13697bd38e3969…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 03:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72c6137979edfdee8a14d3af104d0aab SHA-1: a7c18f4303d6f7a2da0044d4c993fe60860dc126 SHA-256: 3b13697bd38e396990ec12bb44e17454c25cd8bae158852647ac157a37f3a8ac
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely to lure users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chataphan.com/file_media/file_image/file/82403648495.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161452df76fec8---giwapopofatuvoxalimotubo.pdf
    • https://topconta.ro/userfiles/file/48519187054.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v9k1opslm8u0t1ijbov6tgtlq7/52056193840.pdf
    • https://istanajp.com/contents/files/kunonavewexasipopalovane.pdf
    • http://spprp.pl/userfiles/file/1103588888.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/55465778195.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613060ff2a671---78938074498.pdf
    • http://otczenacts.com/media/files/kivemutozasobegatugil.pdf
    • http://diegogenna.it/userfiles/files/91360959452.pdf
    • http://dkmmotor.com/files/userfiles/file/89032513219.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d117e6e830---72442885006.pdf
    • http://hmed.vn/upload/files/sizaxilagepetabafijufozu.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf199a65df---36741789359.pdf
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/danofe.pdf
    • http://vipdiler.ru/files/file/zaxusuledasaganuba.pdf
    • http://inteko-tula.ru/f/file/46575025519.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/34896151fc38b84696c5b846b8527753/nusofepeluxevefimiremebe.pdf
    • http://ccadl.com/files/20210919182550.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/55233094941.pdf
    • http://jagdrevier.hu/upload/images/file/lunajemi.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140916a66393---91865614929.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=nerve+pain+in+left+arm+and+leg
    • 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_off0000b0fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FD 16792 bytes
font_01_sfnt_off0000c90f.bin
e7ca937ff53f20569d2583f704e773babe554bc7c9951544185ad0cf9d89def8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 15328 bytes
font_02_sfnt_off0000eff9.bin
c41fa2d2f72e4df2b75a1d35ed71c44f3fa9b9821183eee88cc7a2ebea533959
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 10596 bytes