Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36a9e53f92715ae…

MALICIOUS

PDF

77.9 KB Created: 2021-09-04 19:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 06f2d857acad4f77ed765cc289ed1a51 SHA-1: 1ab350ba013c40ad5f645a1897b0599d50467b53 SHA-256: a36a9e53f92715ae493078086b25071063b6370064e94abf4ff1e5a8cdc43cad
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. This suggests the primary purpose is to redirect users to external, potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/m6ke3saejb6ajo48ev9pjsi097/95692934291.pdf In PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/54387732807.pdfIn PDF document text
    • http://ingore.cn/upload/files/ledajilal.pdfIn PDF document text
    • http://korytnica.net/data/files/48777515291.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/87748396718.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/pitagojenisukepabogeg.pdfIn PDF document text
    • http://cutskytools.com/d/files/nalubuzuxofexinejoxosojet.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/80e3c9b40735b1cd0dfe979bef269b2c/filivubafikajevozax.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/t5qb76d3gtu68hog2evt43t9j4/90803028674.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608efd434eb6e---bumedur.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7bd7ddc05---6000123511.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9864aec0---lamasujava.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/70026822341.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/bajeniwuk.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/lipamukuk.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d4021533e---pisisorekidodob.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/90963006879.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/57409236144.pdfIn PDF document text
    • http://m2m2design.com/userfiles/43257681375.pdfIn PDF document text
    • http://pk.mo/userfiles/file/bisulaxi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/574andb4itaicbqib50jr0bpn2/83149536032.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4874496e2124be3fb93f847f58c5da7d/boxevanibuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=le+train+de+nulle+part+michel+thaler+pdfPDF 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_off0000c2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B5 22504 bytes
SHA-256: 366cb46dcc4af52fe390e4b7863daca63fb03936fbdce85429ad9d3e82560282
font_01_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 10652 bytes
SHA-256: abf2e8c71178c72df396eb92bc056bfd3a1ebfa153908a4c97f61015985c4970