Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fca56e6f02fd74…

MALICIOUS

PDF

96.0 KB Created: 2021-09-08 23:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6503b0b60a970c06fc623911fb5288f6 SHA-1: 3d7876c9229f8c01b1636ad2b0d5590544c0fc5b SHA-256: 93fca56e6f02fd7496f17e6f9f1d629bc51a8d664275098fd562183ec9b9c4ad
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple unknown URLs, with several hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links suggests an attempt to obscure the ultimate destination or to maximize the chances of a user clicking on a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sdudyogtechnologies.in/ckfinder/userfiles/files/88553141110.pdf In PDF document text
    • http://gardenofsound.com/userfiles/files/jipajemowebapadirije.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/bilileguke.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/wipusejav.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/fibabiruzazofogajir.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb31c9dbee---5130037409.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/96063646971.pdfIn PDF document text
    • http://logicamail.it/draft/media/67112964178.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/90756863454.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ah6digp51df2gbvf379uu2n325/besotewogekusosuzeji.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/jisiderexuremoriwefudejo.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/vevij.pdfIn PDF document text
    • http://shahgrp.com/uploads/tikin.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/43ecde0e05452ea8a0bffe47202e8b7c/1936213251.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/733567900.pdfIn PDF document text
    • http://wohingltd.com/userfiles/68319367281.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/remiketorojugamutupowid.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/68320881233.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/2080535455.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/xuravog.pdfIn PDF document text
    • http://runhouchem.com/upload/files/vijumujepikurudepe.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/82758061693.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/49321880071.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/xipolezepisodaziwumebeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=season+11+the+walking+dead+release+datePDF 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_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 19480 bytes
SHA-256: c8d4f30e020647ad4aa1152a61dcc882af5ef496b94214217794b39ac31713e9
font_01_sfnt_off0001416c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416C 10832 bytes
SHA-256: cc655f1a20ba3d13bd799b31e48aad6a7ea545bf29d11e37ca31fde0bd46509b
font_02_sfnt_off00015a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1