Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b5116836107cd6…

MALICIOUS

PDF

74.9 KB Created: 2021-09-04 00:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f342907740e556b618c064fc3d22fe4b SHA-1: 4417b53e41ba7eba3c1e768a3bc4c6ad5d6c04c5 SHA-256: 57b5116836107cd6158418eacdafc5dcf62fdac19d8b445e131b051e04b00dc5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The document's structure as a link farm, with some links leading to potentially malicious PDFs hosted on compromised CMS uploads, points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://csc010.com/userfiles/file/20210630143004_uny8ca.pdf In PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/163715b182a3a55ddda7c4bc01a6fdd7/wunobinosibisefim.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b689d80c1---pelafilubur.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/41195865250.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/44635786115.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/72665003195.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/mubaved.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/59703097595.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0olqm5aamr736a1dfsc6lalgt3/vimebawirijekakavodeb.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/81890027453.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/xuduxodazotefo.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/dc5hktops9dc3210ksamvum327/nosatida.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/77800237072.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lt6rcunc7lcrldinuicts08vfu/riwomupozazixeweberutemu.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/nepojewigorizuka.pdfIn PDF document text
    • http://bptramptour.pl/files/file/91725353796.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/69105859578.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/bf8cb2feabcf1299797b6e07e74e7d71/vesixot.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121af81202d6---goniwikixenumu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b211da02f97---gifumu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/36212112494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=spesifikasi+suzuki+splash+manual+2010PDF 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_off0000bf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 10924 bytes
SHA-256: e514ecca14283884c654e281b6f4f56f8830eda4c4ba6a5ae613362d46d90c60
font_02_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 17924 bytes
SHA-256: 43c3ac2bd0856f071ca0683e51ada1767f6059aa7ad3ddcc91ccacaf6957a852

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