Malicious PDF — malware analysis report

Static analysis result for SHA-256 5461a3b511dee6ef…

MALICIOUS

PDF

80.0 KB Created: 2021-08-17 09:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7f947069bd0ef6c4c101a1b803103ba0 SHA-1: b004833c496bb307b4f86bfd3061b8f295df998f SHA-256: 5461a3b511dee6ef6515a5e73e9a7d70790e48613d5e1bbace83c1290bf7ae89
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The presence of these links strongly suggests an attempt to lure victims to phishing or malware distribution sites.

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 https://inwebjor.ru/uplcv?utm_term=animals+flashcards+printable+pdf PDF link annotation
    • http://sxsasa.org/images_fck/file/1627974805.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/zakakenomaxoxiwumubojax.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210715182008738.pdfIn PDF document text
    • http://abc-tel.ru/data/File/kilofanifoz.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf367dd66---jepunujadopexudog.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/zuzoga.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108102323498243.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/31108720136.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/79700448917.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/77413971027.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/85669908671.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e9a26bddb7c29a05415f6199e7e4427e/lisifo.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2b31348f013f4f3e80c08dc3f62a5837/66749756236.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/wepemuxoworetana.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/10559376572.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c9991d99---bijepuvorakeribajuzunoris.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e588b0a91ad---68391964030.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/lebukeberimul.pdfIn PDF document text
    • http://yuha.be/_files/file/15748905389.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/nitifu.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/nolebakatolamadi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ce6c538b7---toziwima.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde5e732ec---nulunesefoporitujetigufug.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_off0000cd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD70 1848 bytes
SHA-256: ebe37dd088900a1601315ebdbfada4487268e914aefeb097cf752198025a5afe
font_01_sfnt_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 16352 bytes
SHA-256: cce4fc1fcc159e06da106b1cec55e99af91b4207d8d4a34439cc5232a35e7a6e
font_02_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 10888 bytes
SHA-256: ce6351ddca629e40f2ddcfce9a81e003c3ddc4e2e3c3f2aeb52eb5e83f9ad17f

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