Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4c264d24ceaf36…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 05:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40475fbe1afbca8683470972340fc422 SHA-1: 6d900bebbeba9863377609025c5c6d84a05ada4a SHA-256: 9b4c264d24ceaf36df454ef7ab4a0fd2a61ccdf412fba009c4ac78cb9c144799
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and uses UTM parameters, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=convertir+pdf+vers+excel
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3903b2ac7---lakutumurodomilejo.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d6906ecb---9019678186.pdf
    • https://medosojewellery.com/userfiles/files/ruviwibisurigadinivux.pdf
    • http://sdds.be/userfiles/file/37643687532.pdf
    • https://rh4-h1tapi-turbo.com/contents//files/40553393311.pdf
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/96825204807.pdf
    • https://jahanchart.ir/data/files/file/nomakepafolimokor.pdf
    • http://dptour.net/bot/ckfinder/uf/files/zewamegezumup.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c58d8cea2---59655099736.pdf
    • https://ahha.az/userfiles/file/dudotexututorajava.pdf
    • https://hgb.se/filer/file/nukusaton.pdf
    • https://iamtimeshare.com/userfiles/file/kulazunisotemikubulusu.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8f8e62109e97c95436e79e72985a673e/75767385672.pdf
    • http://njbeihang.com/uploadfile/file///2021090311345936.pdf
    • http://velapower.com/glwh/UploadFile/file/2021082207325873499.pdf
    • https://vayamcs.com/content_files/files/lurawez.pdf
    • http://sapientgenerator.ru/files/userfiles/files/wetexuvapi.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/37504817020.pdf
    • http://eapver.com/upload/ckimg/files/202108282105381802.pdf
    • http://flywings.sk/UserFiles/file/wimiremikega.pdf
    • https://marblo.ph/app/webroot/img/files/wemajupojupogoxojevo.pdf
    • https://biovuspharma.net/userfiles/files/kerowu.pdf
    • 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_off0000d66e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 16792 bytes
font_01_sfnt_off0000ee85.bin
4bc991d446716130cf024b0e911e204707154c98e21f3268723f54551be3e1b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 10648 bytes
font_02_sfnt_off00010712.bin
db04aae0d8be48bfbbbaae459ad6bda9ab1059d368e5664c02049c6ffebd6443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 19964 bytes

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