Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f01e108c53d7063…

MALICIOUS

PDF

97.0 KB Created: 2021-07-02 00:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3e90103a9c5ba8b4d46996109d441e6c SHA-1: 26f47959eca49b640cd4c632eb0b9cd03a48e812 SHA-256: 0f01e108c53d70638ccad1d824c4e9135ff6d4bd7afaeda98eddc650ff4ef366
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm hosted on compromised websites to direct users to download files. The presence of multiple URLs pointing to compromised CMS uploads and disposable hosting, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a secondary payload or lead users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=gta+5+obb+data+file+download+for+android PDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e65ec81c---jabivomotuvezani.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/gupesomirofifuliresigufo.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/77778076220.pdfIn PDF document text
    • http://talleresjpg.es/img/file/zaxipimi.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/ralimubuwirawalezuv.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210701_F41087CD393B5323.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/40666442390.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609717e527058---76977680276.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/c222d4755be00bf4e2b6bd884d001355/nozododifelasixiriwi.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/9123206094.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/c02jeti8p1s1mjkaruhmjv73ru/79693949590.pdfIn PDF document text
    • https://lasanisports.com/files/87992503151.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/tuxiterejoferu.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/luboxopug.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a857f0b99---51875090085.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e05bea3c6---27549259909.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/39996081728.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/tarevituzodowaturulaw.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/zafawifiwa.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/6cafad2585c6a7998bc756ae95a5451e/61325515568.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b85767e7b7f---12308380886.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/n2hkeuftbcjbnm7c4g8n9obpi2/vikame.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fc4ad355c---jesirosilobajolova.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/55578989901.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11855 10580 bytes
SHA-256: 1e1ef4e9d6952a1183752962de31aa73f34456bf822059c3b7d0b9ab18dcf282
font_02_sfnt_off000130af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00014627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14627 18460 bytes
SHA-256: ef30c7f051309367eba24031ffdd193fe69ccf268ca8abcee501c66d1321eab7

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