Malicious PDF — malware analysis report

Static analysis result for SHA-256 450b87202d10f794…

MALICIOUS

PDF

96.0 KB Created: 2021-08-07 03:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e49b258b412598304ba578f4370a7c6 SHA-1: a810c86cba49bdd2ec68a8e52c2855d804831ed7 SHA-256: 450b87202d10f79485c8001d67a4d1ae49d3063cfac55439d9cd5eeddb486976
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://an-professional.ru/img/files/file/xonobogaxunol.pdf In PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/18953575827.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/78613598291.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f751b08576---gerajixadomol.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/51925742852.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160989a782583a---laroxejijobemozilev.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/supokeruxo.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/77524276640.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/92581201883.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4q5cb3q8a2ij12fdrge6gud7aq/86471546700.pdfIn PDF document text
    • http://industra.sk/userfiles/file/13317434008.pdfIn PDF document text
    • https://roc.mn/uploads/files/naxefok.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/99204148775.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/77788999419.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/72708736963.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/26820463925.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210715_E8073396827DCC0D.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/df4476f3422de0a13f3b394e1dd31ef0/93707525256.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073819d6ae8e---25411610921.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b4b4652aa306efb7360efdba87853ddf/nijodoxokuvasazowegovewu.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/pifupafoxumigewosebid.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/78384567641.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56b341bda---nuxisojiwiseko.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/93066097214.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/62059254336.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/sepalapunav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+pass+the+dmv+motorcycle+written+testPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 17544 bytes
SHA-256: 28e165bf025c7dbc1b8c711b61d6afcd3c21d92dc3ea8e78c017e90012b09cdf
font_02_sfnt_off00014250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14250 11036 bytes
SHA-256: c0a6426086ff75512ccf232ad1fc7740063aa7d53db939c72e13c5022b24305d
font_03_sfnt_off00015bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDC 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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