Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96695892398c2bd…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 16:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82e8a3957758a284e6cbc4c931aeba4e SHA-1: 9669ac02c50bb8c3ddc279c6035170cc92dedba2 SHA-256: c96695892398c2bd60b4b14e64842b3b6e1fea55d3b80d5f15b9aebca19786b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs, many pointing to potentially compromised or disposable hosting, designed to redirect users to external sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or SEO poisoning campaign.

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 http://droneducational.com/admin/userfiles/file/84703720633.pdf In PDF document text
    • http://rassadaspb.com/new/files/file/94143372839.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109061554232589.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/lolunimamaroxo.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/86027965127.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4db6598d812ef64a0cadb12cc1077f2d/82287122136.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/84007605126.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/81694166847.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/8017793732.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/74383208989.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/28965568901.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/30524834120.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/96b0d8ea5fba04329e9f4a20b7b68fc3/75293085385.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/64488667028.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gimrga8poas1rmp87g73v3efg5/4344446189.pdfIn PDF document text
    • https://euchebnici.com/img/file/6966600736.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/43145064300.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/kojuzuxawexirurozekalat.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/juruvewetidedadalapop.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/42749204251.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/megakazajo.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/38862235470.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/3745601221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+to+recovery+mode+macPDF 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_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 10560 bytes
SHA-256: 84720982df2cdcf3cad53e380654146f1f4285a33268f1ef7aa24c37a83bb537
font_01_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 17612 bytes
SHA-256: 567e7569221a893cdc9512a649e814b6e4a8a67c81128d8f21032a2637db7116