Malicious PDF — malware analysis report

Static analysis result for SHA-256 94be574b44f04a0e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 16:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74e7ecf3493eb8df21fb8c0988a912bd SHA-1: 15c981fd499ff44304944de675b3dfb154781b7b SHA-256: 94be574b44f04a0eee4e5ad65b49478986df6d1186c25c155da07a3004e1438b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery mechanism. While no scripts were extracted, the structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://forglass.sk/userfiles/file/vewipopubaxidu.pdf
    • https://livredart.com/ckfinder/userfiles/files/xurowiwajomiribu.pdf
    • https://koratspring.com/upload/file/79749789949.pdf
    • https://loppisidjupdalen.se/images/uploaded/file/44197454505.pdf
    • https://bellcera.60km.com/upload/files/67805342252.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/jgvfdpncorv3d2se71bgc9p1a5/xisodanidesovasati.pdf
    • http://analogsys.com/uploaded/file/142693846361505ddc44654.pdf
    • https://stoneappeal.in/FCKeditor/file/nadenosefimonetomugota.pdf
    • http://fskyok.com/uploadfile/files/87089448175.pdf
    • https://doctmcooper.com/userfiles/files/11459610453.pdf
    • https://hgb.se/filer/file/4408773390.pdf
    • https://n-zvuk.ru/upload/file/55698558696.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/47725475535.pdf
    • https://www.ftha.org/admin/ckfinder/userfiles/files/88336958845.pdf
    • http://kowel.com/ckfinder/userfiles/files/1632486878.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614039d044c2b---vevomuzomobojon.pdf
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/89099165202.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c434676bf6---fesekinujenaxik.pdf
    • http://sgrappresentanze.eu/userfiles/files/ketejoxikenofunep.pdf
    • https://ekoelprom.pl/public/images/editor/file/lefumixupukedatasa.pdf
    • http://gmart-express.com/demo/uploadpic/file/govosewuzatomilesudo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=why+does+my+tablet+keep+kicking+me+out+of+games
    • 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_off0000b002.bin
0fdcf84ccac01ed0ecf50585091773be01eaeae2402f65c02ed91e65f6d6e6cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB002 15748 bytes
font_01_sfnt_off0000d829.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 16792 bytes
font_02_sfnt_off0000f040.bin
a5330f4cf9cf2a79af039b7b1350798137441b01696c9b30a36184c800caee11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 11408 bytes

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