Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bc28cf1cbd3dc2…

MALICIOUS

PDF

92.7 KB Created: 2021-07-05 05:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1dd353f76822dea0f296016b73480ce SHA-1: 16ba6ff3bddf66ba8761ee920acfb32e6fbf2179 SHA-256: 99bc28cf1cbd3dc2bd3de938d899cc6817762ddc017e9140adba7ba7170051a0
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content on external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/50c1f548ca9edc421997c34217dc3824/poraralonapopokozuber.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee29f001d---18920094501.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e059d503fb---lifodososefefunex.pdf
    • http://sushimura1.com/uploads/files/47980818909.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/08cd7587e67d42d3819ce9f3f660c716/39116808182.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/78bae754dd318a22653188ff345279b2/mozobexepujawinujifi.pdf
    • https://mimpishiosatu.com/contents//files/55245706403.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c660118cb---wotiwukatanuziwat.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b417167c6df---38516261748.pdf
    • https://securitydm.rs/slicice/file/76547017083.pdf
    • http://dentherapia.hu/files/file/91444887024.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5f7571fc915a623cd6f6caaf91adae94/mevudetafekolaraxufugeg.pdf
    • http://guojingmall.com/userfiles/file///48424881596.pdf
    • https://haidangpc.com/contents/files/bixefapiv.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8ca6f133---46167975746.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd88967117---7799484512.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075c91805691---gikofosagurubarizavufi.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16076771eb5cb6---novijewulasa.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724d8ecbf88---29697314900.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d140ba0d8eeff48d6669b69b0a46e443/94020833375.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/881cbeeca21f9e598038e1605aed9e30/dezotonokaladegudegika.pdf
    • https://sgotomotiv.org/upload/files/43013644050.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/223e66923b449f80fe560794402aadf3/11773408520.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=armstrong+mt500+manual
    • 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_off00010414.bin
c9d11482f82b3ee15ac1f7d40b5274612fb2058ccead9292eb25009313a53711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 10564 bytes
font_01_sfnt_off00011c3d.bin
c8b4a1e55f4373299c39fce2d25afb9c34ae8fb221991c4e425b8fc76a976de8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 18592 bytes
font_02_sfnt_off00014d9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9C 16792 bytes

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