Malicious PDF — malware analysis report

Static analysis result for SHA-256 234907535cc5fa05…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 08:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc83dbb6ed87590ce5cdb4af346cf9a1 SHA-1: 0d4bc148229515d679452e355275f52de8cc07c0 SHA-256: 234907535cc5fa0577cfe3e150a7a81035d5e85af0cdf04de191de94d85d363e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=online+movies+website+telugu PDF link annotation
    • http://dulichtantai.com/files/uploaded/files/84622063368.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/55370347167.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1bc08d9c---51495021632.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/xezosatumefidakajisibi.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/2185521130.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/keketiwa.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/17650839396.pdfIn PDF document text
    • http://ore-processing.ru/d/files/67555401450.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138129a89151---48009850115.pdfIn PDF document text
    • http://chinalabware.net/d/files/47726460178.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/buwutivo.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/34818125956.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/42972609638.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/87747708412.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/41705446205.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/gekoxomewolijuzalekotori.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/85489169135.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mesikilukov.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/11063388770.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/18488652447.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd35b860cd---41137892501.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/bopeloxex.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/38138201795.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_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 10608 bytes
SHA-256: c2febd4192923f9d19d215580886d04688294b758d5e6f4ea6e0b00c763f188f
font_01_sfnt_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 17316 bytes
SHA-256: 1bb1c96b9bf41a94f3566dfb82e04fc9a0b41d8b6f7c1afb935fba320b6b049e
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1