Malicious PDF — malware analysis report

Static analysis result for SHA-256 4097257c5b5ea3ff…

MALICIOUS

PDF

80.6 KB Created: 2021-07-01 18:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 068ac8ca47f60fb003195a6651ff54b4 SHA-1: 7eade41185fc598197924d0f572055e54e826d6a SHA-256: 4097257c5b5ea3ffdcb0089dda72b3e6da9eeeeeda5f85d72b288676622ebf21
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these links and the nature of the PDF heuristics indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81892401e6---jimuzo.pdf
    • http://adabaskimerkezi.com/upload/file/fawizozowadoxaragifuvetu.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/1acuj0iitev0l4ptd7qp6n7rh2/39965094822.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/3d8da99c912168b6300eda71afca4f56/zodufinuzudakot.pdf
    • http://sicilyontable.it/userfiles/files/99199013157.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6fe958bf1---batonorapubidofebeziwowaz.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1099b92c63---goremamofijijux.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c0834659fd4535d6559121851d826010/fatakan.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/775a4b1bc43599bae6f726119c08387f/40147249711.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/16634519909.pdf
    • http://valaptop.com/ImagesVA/file/luxovesebiz.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7a1ea6ca---rutajuwosexufog.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/3h86m10g5arl3msgmpr6kk6jrl/miwugurenekajuxilajuki.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a07510dbf9---xofolapabodejepegifi.pdf
    • http://brukbet.com/user_images/file/mepaputafazinemokepipe.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fd6540d4abad85db2bd7dc13e1971782/bunupumalekixudipifag.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16229199607487.pdf
    • http://healhumanity.foundation/userfiles/file/xudulonod.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/69464071784.pdf
    • https://aimhc.com/userfiles/file/wopikedipajeluvevunuw.pdf
    • http://hitecds.com/userfiles/file/2660317446.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/2aac84ee7438008154f0f0edbb162422/pafokebemasuwu.pdf
    • https://amblamy.ee/upload/file/82206944382.pdf
    • https://a2designbg.com/userfiles/file/55857429886.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e802ac2a0972af53f9b4922dff4d31b5/32155604425.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=high+triglycerides+and+normal+cholesterol
    • 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_off0000d87c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 16792 bytes
font_01_sfnt_off0000f08e.bin
287ceba55b11efd5f05703b5e9a75afe04e2c062583f31518c75244c39e4b556
pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 16776 bytes
font_02_sfnt_off00011bf1.bin
b985bb2942801c932b4a28eca285802bd9f2908168e2dc9f5a8f1c4a252ad704
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF1 10924 bytes