Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc6dea1d930a66b…

MALICIOUS

PDF

90.9 KB Created: 2021-08-04 04:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c00739930cd0d195bbbae2ee274aebc SHA-1: 51fcf8aa2e1755b3aaf136bb1d51595c1949b6b8 SHA-256: 0fc6dea1d930a66bc7f97d9210947388060c65cee803ec36c9bc01fed7e3b7b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://houstontca.org/Content/uploads/files/wifisijibatuvedugusamawim.pdf In PDF document text
    • http://prestopc.it/upload/file/14938896505.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/jakegabavesi.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/54241372269.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/208618298660b22bac54aec.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/petibunuga.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/q016uh5nghgeb25kf81626jav1/tajidimobol.pdfIn PDF document text
    • https://rinducm1.com/contents//files/zozuwegoj.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1aa158f72b1fa12bb1939b74c280498a/bekewesoxigamewojemin.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081c8b614253---74832335114.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/8dc6f099a05e7f42b7cc30021de0d4e4/rulivep.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/kovufisenezur.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/zedanawekaxujon.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/fepugosabiwa.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/43575856489.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/e44jqsdl8brtnusj1ju02780cm/xajuruzibaxabusebelugi.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b441722a70---44416933601.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/lanaxuwararaba.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/fetererajagexulakamowuwu.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/d14d3e15289002d02556e7a84ba45123/nusaloxamujaj.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbae0c9022---besizej.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/nufosuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=per%C3%ADodo+simples+e+composto+exerc%C3%ADcios+8+anoPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 20088 bytes
SHA-256: 97a10111569371dea982c05e121bb8a5e7c97c939128c1be7d6d21c83cc69b67
font_01_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 11048 bytes
SHA-256: 31075282df4b55bb6178daa939bf26e744042d3a0a85933ea98c8f912cb60bb8
font_02_sfnt_off000141d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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