Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d724c8c26e756f9…

MALICIOUS

PDF

83.6 KB Created: 2021-07-03 09:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbb558ba6e6c5fcc60b6c01a6ccb759a SHA-1: c71946321175f11de70d351ccb65b76c4557c25b SHA-256: 3d724c8c26e756f9f365e89f6e7a1c6705cc34426bd847772900e4bb9327b7a2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to numerous domains, some of which are hosted on compromised CMS uploads or appear to be disposable. These links likely lead to phishing pages or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chithanhplastics.com/uploads/userfiles/file/67167201309.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160811de6b7073---fudojenuwak.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/kumumowujusanuburonaj.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/kugugakunite.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/xixefuxotuwusunuzilafolep.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/r3lg751k44vvqb8d9k354t5iit/kuxusoropud.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/pimijonazikanusedatebe.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/gavenevutomalozerora.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/42459497293.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/fezepo.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/vopamimuj.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7bae3d7591de338f48319b8dbfe7a98b/66901534736.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/mudisitatijawaw.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/7j9qjv8fb8k7s1u8inbfo22l2t/67472605158.pdfIn PDF document text
    • http://ligneus.hu/upload/file/jigedel.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/maxamobotizeruv.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/65872663334.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/rosademiwamut.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/nagozijoregazizoxajez.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608494f20dcca---pivekukubizi.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16077572a02ad6---xirulomopegipugusu.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b9431e2f---99649119367.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210616060919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=math+answers+solverPDF 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_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 18984 bytes
SHA-256: 75c23e6ec292f33f0c173ea8ff947720a64fa73f8795c7312466a7bb69599228
font_02_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 10260 bytes
SHA-256: ef289813e00b9b7d8106bf107954b4713e611a6e32fe2245fad71847124e9ca9