Malicious PDF — malware analysis report

Static analysis result for SHA-256 b651262160df2513…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 09:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9ab03c786a2e546692961c6fbecdb108 SHA-1: d39d947ad2fc7a3aa4f77225da3606f43fb3ebe2 SHA-256: b651262160df25132e3f14c1e3287b549d9a4b4f5a34e371989327b596b6c220
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://agrando.cz/files/file/88156856470.pdf In PDF document text
    • http://kisito.com/userfiles/file/1272430949.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/35460555890.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/ruwowadavotulepixijami.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371919e4829---buwemutilotebifizupasi.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/xuxaloletugez.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631802209.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161384e0990c1e---vazuselozebukubukox.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/90178004693.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/99966306961.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2836a9d8de7989b927f1f4ce0844058f/xuzuvire.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6dfbabcff2613e605ace97987f4485d5/luxavekejalumalelamodilap.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/39210021372.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/52862572671.pdfIn PDF document text
    • http://turnyras.lt/Files/file/30374977333.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421f4646984---lopatanuwizegejanuxogam.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/27035093306.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/lenupoxukofaxirebud.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/buxuwarulad.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/94194764424.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614025569f2bb---81938910818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+personal+assistant+namePDF 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_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 10532 bytes
SHA-256: e6b1398a7bf63e30f0e0345b8841ebd5cfbbcf98d318c313097bba5bcf130a6f
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 16748 bytes
SHA-256: 9f6bf1207cd5b9612ba6ab9f1ceff0071a1a25bf177ab78e4b50851640339857
font_02_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1