Malicious PDF — malware analysis report

Static analysis result for SHA-256 f573f3f49e1e6e44…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 16:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9064c1b0d46941eb5b185237e70e4d4a SHA-1: e66ca82faf89f1e2337e59180b6ed4bf2a2b6983 SHA-256: f573f3f49e1e6e445e10337ada791edf63baa18dee5a22e9b069dbc65234d625
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which appear to be hosted on compromised websites or disposable domains, suggesting a link farm or phishing lure. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass security scanners. The ML classifier strongly flags this PDF as malicious, and ClamAV confirms it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=schalm%27s+veterinary+hematology+pdf+download PDF link annotation
    • https://yellowmangocafe.com/userfiles/file/87902157329.pdfIn PDF document text
    • https://totounited.com/contents//files/fakepakabu.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623004318.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9876773c83---74228146193.pdfIn PDF document text
    • https://promise-land.com/upload/file/67150962580.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847ec3a4d2d---zokegamil.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fa29d06219f336646ecc088996bff01f/66239167606.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/32363181098.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/75360384159.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/delomu.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/xanozodevek.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/55734048963.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa1f25c91d---kutifinogi.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/42668674938.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/90546059326.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dcc88532e---kutusavogogotu.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/7815337227.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/zoderatanopog.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/xigovuzozin.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/79f0abb4929f03c40ddc90a0bf5daa0b/gujufefujifife.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/gezetomubojagusom.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/19924251530.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1b02a8d72fabd0aa24531a7c11051f52/pokagizerosediwotugu.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/zefuvoxakuwudawojes.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/vusubikasezusaz.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/16101382979.pdfIn PDF document text
    • 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_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 11440 bytes
SHA-256: d674d2b741db37640ec4c4f9ce783b14e6f8d16dcd103892d112f5d8d24ae8e6
font_02_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 17644 bytes
SHA-256: 5fe6b153dad306e6b7a47e8c2883ee82b0a8c145503a608d0c1fc72b37c22770

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