Malicious PDF — malware analysis report

Static analysis result for SHA-256 29007dd76ce7358e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 15:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee9bca7c42e7d0845f92cc55fa9dfbc4 SHA-1: 544f87186e3f0ae7a3cfa813625894f885caa06b SHA-256: 29007dd76ce7358ecdb6451942c7b50989d6633411bae6704317701bee67d166
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farm heuristics suggests an attempt to obscure the final destination or spread malicious links across multiple compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=song+stairway+to+heaven PDF link annotation
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/90966853179.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/kowonuza.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/74729142096.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/43586470597.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/gunukagodurizelividujojop.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/vinozinow.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/taxuj.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f355d9aa7---fadawetezu.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/bibemapebudapisan.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/a9pj3t7djv1c6qpgc204fjrh0i/dotuzi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vixewamemavuvo.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/72483764609.pdfIn PDF document text
    • http://prosquash.by/data/61232882748.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/josuvawodap.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4u2q2cmlod43bgid6dopdodqf0/79350199963.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/bedinopejukinu.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/xetopetite.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/39423517632.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/95535646660.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/zivakasufowojuw.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/27105783994.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7cca1f469---riganavupisuwupigof.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0e672a47---tevegewirasi.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c005469e16a---20370374018.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1cbac1ca63fdcb9d0e399388b0bd802c/12681278056.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/88373827778.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_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 18752 bytes
SHA-256: b963ee825564f976f705425786ac7587503bf987d0d687966f9c6fa8dca733d1
font_01_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 10684 bytes
SHA-256: 05be4425945bcb7891dcb40f1dc98ab0de6a8cca8e72d9d9cdc8fec3a7a7deb4
font_02_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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