Malicious PDF — malware analysis report

Static analysis result for SHA-256 127d8dcf29878091…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 09:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bf294d515b86a38d119c66e3bdfb6f3 SHA-1: 5b2c63dbc89a3bbffdb191447f8faa8ee1dd3945 SHA-256: 127d8dcf298780913739e506a524d0ced390d453e0a27321248cbe0ca365c2f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.tristar-technology.com/ckfinder/userfiles/files/82962064301.pdf In PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/27230632703.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/saxovikegopunaxegaxuso.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/71795151237.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/96644878168.pdfIn PDF document text
    • http://scsytech.com/upload/files/67084486029.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/balemolowajem.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/h235jan163l4skhkmae7blh021/21280696571.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/mububizonemosobituj.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/posif.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/31689022020.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/xibagasanezozegunad.pdfIn PDF document text
    • http://xsteelstock.com/d/files/22013717029.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe5a04981b---71445213070.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/88bd3980f5519e43a6f9c2d0365a9ad4/64761098074.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/19383857014.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/roxemuzo.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/72245907923.pdfIn PDF document text
    • http://tchid.net/userfiles/file/kojenapiseraxafej.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/timitemigudifunexipuda.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/14730896616.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109101149045115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=roller+coaster+tycoon+4+apkPDF 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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 18136 bytes
SHA-256: 1b8b5f4711e53fed5014887db08df96ecb192cfc79476d627f0444ddea77c293
font_01_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 10604 bytes
SHA-256: 18227a5c128f835d5e05bb3a3b96bf9c170c25bc1437e9305e7841abeb89004f
font_02_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1