Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b3d2eb6cc4950d…

MALICIOUS

PDF

90.0 KB Created: 2021-07-17 04:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e25505352f834df86952a25aa86226b SHA-1: 801fe8ec5f1190ab6798fb1501ed3d1e78ad280f SHA-256: 24b3d2eb6cc4950dd916a2581fcf1cb2d7b7a686eaec25e02a54f108a05b3d36
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5093d8c6e---75543421259.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cb334564c---65663250579.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/fb803c83cfb22ede67a80ba0ed85aacc/zajoputiwelejidenojuvi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/juximamufabozuxuzeje.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/nu2scnuetou7lc300aolp96hj5/denimupovonitarasikedekud.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/wafepesiposapuweza.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d38e47e757393ad65786692fc486daad/revusekapugiza.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/suvoz.pdfIn PDF document text
    • http://zkpower.net/upload/files/72601137040.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/9d4emmka94o30om76e6ceh3oi2/87520619739.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/doxejefenowo.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/natelesot.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092890d12096---76001830675.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ab7972b27d53655bc21cf872c0099a1a/42160090011.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/wafeg.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/31496360759.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/qs4b9548ni1pe5dnjm2mnr5ls6/7449332200.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607236195ac53---luripenavobowotasulejewir.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/5005049373.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/kp8em8lt56cmnp1dr6eli8f492/26132126251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gta+vice+city+full+game+zip+file+download+for+pcPDF 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_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 17144 bytes
SHA-256: 56ba860f5f79b2116400f525a8e672cb1a36bdd434a9feba585a40f061d1ee99
font_01_sfnt_off00012838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001404f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404F 11260 bytes
SHA-256: de0397c7971a2f153169bc7bae2624c27f4ddd61db7366db1a8cdb22b593b51e

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