Malicious PDF — malware analysis report

Static analysis result for SHA-256 3725229d297da3ab…

MALICIOUS

PDF

88.6 KB Created: 2021-08-18 00:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b17a1bc98b6654ec7285af2989144219 SHA-1: 52bf614e2409a35fa0d86041a63c09ebc7a34587 SHA-256: 3725229d297da3ab59f3ccb0a30db5813f3761db52fdd9dd19a81456a37323c7
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting user trust through a seemingly legitimate document to redirect them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://emmaushuis.org/pages/92666946094.pdf In PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/8f9f12dadb04aebc787d11639873cb2a/47367939586.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12302499897.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/13665772863.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70c3671d8d---10170910515.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/47675424269.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ds2su1m5e01hl08p0erce8du5n/loxufugawib.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/wazoxukusivanefaja.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/62711532140.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vi8oqrfjmsjnpsqqbeverad0p6/texewumokorejibiti.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/03ib2mjeqv7ldvmnas5or916dk/xoturifituw.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/71477243579.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/kifawipuximu.pdfIn PDF document text
    • http://poorclarescork.ie/images/tefizo.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/fe13b3af87f38613685d6f6222b9bb55/38109449448.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/37556252731.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/36380714853.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/96910904888.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/39748639951.pdfIn PDF document text
    • http://kco.su/userfiles/file/gadefudopikase.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/ninixepaturujus.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u5op9258s3rfpuh911pgrlecd7/wokapuwepidasuz.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/96178939238.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/87101420051.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72cf5d938---42355846601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=los+siete+sacramentos+de+la+iglesia+cat%C3%B3licaPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/98006253088.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_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 18116 bytes
SHA-256: b4183ec03ade2ac752050494b52425ad2d3135d85a94187a6fac16147e600a94
font_02_sfnt_off00013934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13934 10808 bytes
SHA-256: 7400d148fa88e6e7b10a00d20c052961b01ad101362b5fd63d63a487ceeb9b27