Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25bcf738bf5623e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-11 22:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d385e18d890e25d04f21ba3f7391d943 SHA-1: 620fcf00c433990eaf5d2ab949c1d9d8803b22ed SHA-256: c25bcf738bf5623e46a61db4a87ebdbc777458e9fdccb061df935b5912d2dc4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is designed to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=how+to+write+attn+on+envelope PDF link annotation
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/fc00e367e7f24a6e9f0df1e59d26c010/84209855560.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/41873341376.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630651018.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/65174817205.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/zaxijawifagobebulul.pdfIn PDF document text
    • http://aa-nusd.jp/rowetozuxegumufixa.pdfIn PDF document text
    • http://splogservice.ru/content/file/rosudogadez.pdfIn PDF document text
    • https://priscar.com/documents/files/78183543096.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631384925_a39f37d4ea.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109082127373498.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4a828fee5a12b9902ce9249add64d597/gulolufagiril.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/86611300438.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306029ccc5b---luviwukakibiwiwazuzet.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/80384969749.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/26546517074.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/borirorejutasodegolux.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/43664563721.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/sojatalafirub.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/paxuwusimojuw.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/vimuxadamumimod.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/soxufuwul.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/16077165105.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/lurimabo.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/92159641042.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e32a85b38777b45d2325ae987d741c9a/lufuje.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_off0000b684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 10220 bytes
SHA-256: 2ac4893cf384daf82c08191a42093890ecd46696cc94c542d184907177b2cf2a
font_02_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 16504 bytes
SHA-256: ff9e7c8aa417e45078382e3a313ff965d5d206ecb3d7e57716ad6b9ed64eeba7

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