Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1239b378858750…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 21:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a49aa3f247538715d5419756acde3f9 SHA-1: 1a3821884332090ea63c845101be5747fe1dd552 SHA-256: cf1239b3788587505fa8e04eb2601aa04c73d9296c3ebd2d2f82ce3a509d5cf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the detection suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/rj5nsffp7fsq9g62qsok9ese41/61764112735.pdf In PDF document text
    • https://kaimano.it/file/jizulefosejekamatidaxis.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/8791305544.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/86968680294.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd8056bd84---batubaderewopusidex.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16114524b58225---dubasipexapufez.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b0353ea85---xunivalumakubusakerepilut.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/89cabc85dab0dccfb203f629db6fd157/96012518298.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/62559621209.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/45422158635.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6885c3c1e---88400474858.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/10716540745.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/51842702247.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/sutaginumojizas.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6778ab5a800b32b48d5a4a12653420b7/powavomifirafigojizav.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a971d972e40---27894414185.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/204im829v57h6c50d2ad0pqntp/86916757158.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/bvk4ivu2u6o2l1bjumle5at23q/10276469167.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/634hstdd7cru0pa9qqec71lku4/20147529376.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/19860129799.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/52266793768.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/37498525.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/h6pnp0kqa0t0q7vv4c96tl4dsc/penodomezamigile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=purebred+berkshire+pigs+for+salePDF 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_off0000ca8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 17992 bytes
SHA-256: 826d788529351e740b50c846f48809b7a97c26b1459c96b65f88b89ff7319f87
font_01_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 10908 bytes
SHA-256: ee05ed4cd94fe61116bc757290dc9c81ac82fba9ce4bdf8c428c89b960f32b66
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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