Malicious PDF — malware analysis report

Static analysis result for SHA-256 0114e2873e762e02…

MALICIOUS

PDF

74.7 KB Created: 2021-09-21 00:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c876a503e164152861647ee42ebc7d93 SHA-1: 9bb30b5e2bbfc588ced14ed276bdce63cd457ac7 SHA-256: 0114e2873e762e0209a418a52e026b089b4aa07fe1051b8e1cf933b92ee9d21c
176 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=ninja+turtles+wallpaper+for+android PDF link annotation
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/54213837196.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/64211456482.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/65606414621.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/1246360609.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/navezerukikededir.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/rapuvugupuz.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/1298693661.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/wasedizefazerugipidubo.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/mejositusajavinumi.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/73778993876.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138ecb6d67eb---7240859113.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/xizuru.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/163148318226dcea07f272e141f.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648d35b855---81814016073.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/bosekakodoketomas.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8f4fd67675b3a59bfcc9d4e94d90a6c3/vuxajurimodawosutifak.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hcnrea7vscpnqt888o9kvm6ab0/11608712880.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gujipapujaxebilevasoduvap.pdfIn PDF document text
    • http://forti.in/userfiles/file/ranab.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109181802599241.pdfIn PDF document text
    • https://wmu24.ru/media/file/teritawadejefapeweko.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/jotatebetuvux.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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 17572 bytes
SHA-256: de37014b4e84fb13f1cd6bde47cf1a16259341314b3b1e3508b85dcea36063b2
font_02_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 10784 bytes
SHA-256: e06d33f493630b5b185f04608ccbbf3c38839d478d32b8c8f21908a24eb549e1

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