Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bf8fa2b43387aa…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 20:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02c038263a4895bb9cd35474d9969e1a SHA-1: c4145b0dec9dcb9cbbc9bd43a3af9faff6c46a97 SHA-256: 71bf8fa2b43387aa123d90a1e72f68bbc3f9787e1c9273dfb82fc6606c82eb67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the malicious intent through a network of seemingly unrelated URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=accounting+standards+pdf+summary PDF link annotation
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece7b1df6c---60528356786.pdfIn PDF document text
    • http://zubrcup.by/files/files/67655838976.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/pelab.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596989f370---99150557916.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/53607113125.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/73961216948.pdfIn PDF document text
    • https://avenue102.com/uploads/file/59647868913.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210827112452162.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/fejoti.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/gubuwazunolu.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/82931896565.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610b6c3c2b4ad---31068401842.pdfIn PDF document text
    • http://palami.by/images/file/38376948059.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611a50e89c705---9675413180.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/karexivi.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/31779969421.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/70888095665.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fkr2unphuphu4i0dstpch59pm2/47326916452.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160835c6c4d132---wazunafuje.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/18556807432.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/28456631791.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/juzeloxim.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_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 17788 bytes
SHA-256: 0fd74127c9739bd830599052b9709865300d57ced70176b0337e95823abb69a0
font_01_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 10980 bytes
SHA-256: bf437f44ece5e44cf7a57c06bdb9695feedea9febf27de91992c5a40be0dfa8a
font_02_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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