Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3edd50acb399eef…

MALICIOUS

PDF

83.0 KB Created: 2021-10-06 05:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1065f52ef75bdab7ba742a6db6e5c6d5 SHA-1: b942d9c86c58d46c3e1065a7358ac7d726af7be7 SHA-256: f3edd50acb399eef424d750a9be2864eeeb60ae90dd6d78bd6aa6464cb68f9d1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://testagenda1.myagenda.cz/pictures/editor/files/xopenexidegiref.pdf In PDF document text
    • https://keluargamimpi2.com/contents/files/rufibidimugejoteluredabu.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/68337719908.pdfIn PDF document text
    • https://gilbertems.com/videos/file/1777214946.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/4703646870.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/donegefalawisoxusapa.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/92624382705.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4ef24adbe909b9285854d5f782a4f373/30867392547.pdfIn PDF document text
    • http://fructusartis.com/i/File/toruxatufegawexanumemabe.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/sulotewoledotumojoza.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f2f8110766dba0a024c0c9e169bc9222/86620203601.pdfIn PDF document text
    • http://sjhtractor.com/d/files/22282951628.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/dakilowa.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/15259325852.pdfIn PDF document text
    • https://eurotig.ro/file/79743897422.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/36235610647.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/jubitisixul.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/fazirut.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/70912291372.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/53651105846.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/47663108198.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/nonamezibufavabasomikike.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/21639862446.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ac76d1b70770a04a37b306ce510913ef/nesuvulubinomofokoz.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/23433611220.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/36671264487.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/kanisapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+cure+three+imaginary+boyPDF 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_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 10780 bytes
SHA-256: 878fd2893cf794eab0ba286be77c55daa25869b13b80d0fd8d681d46c1e560c7
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 18884 bytes
SHA-256: b0c10e2280ee49e29abd75aa2d802e0cff764081e83170cb42da7064a3f54e90

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