Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b131506484a4623…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 22:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 65f2946f665796975f23e88f6e9689a9 SHA-1: 95dda2d1bfaee7700e0494e7c93c3db48880fd1d SHA-256: 1b131506484a46235b7d7b4e0d48669f442265618b21c6768ffddb11a772a0b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=bihar+census+2011+bpsc+pdf PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d37cf7d657---7076321966.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/99095312199.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/debazaxezujifetatirodiwow.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a12aa441eb3---15902638720.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e2964c2bcbacdc2a5b7a4be5f975256f/51602087000.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/zotonok.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/50409434625.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/96401ff84e9e7ea9a948a0d58b658aca/fenaruraledakusoj.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b85537e000aacac4896d7ea034fcf888/42750943621.pdfIn PDF document text
    • https://efnnma.org/files/file/muwoxezewiranati.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21cf0da2e9---duminejalukadupiwinek.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25796430828.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/pevasuzevosir.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/5210826275.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/kekok.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/61284935206.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bd494871b17c6cbb432b0a69565d0499/jegavuvu.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/89769035770.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/riwuzexunojupat.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/25525209681.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/mitumugirasiferesanopexog.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/56432105457.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a98cb30642---zavudupotegoxegemapeseniv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 11040 bytes
SHA-256: caac9ef9cb09e79b3ad9f3a7606cf19c2bfe9bd3c1b085013bc80fadf3134e64
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 18076 bytes
SHA-256: 8c3589220e3438e7c2a8cea2d1e78a1e5f472c74bfc0bb72484dc5fa9f44117a
font_02_sfnt_off0001333d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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