Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13060071d45334b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 20:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47bc7aca6814595158a0695c13694892 SHA-1: 2863e25afd54eea65fb608c5732dba0a9eed988e SHA-256: b13060071d45334bc6d03ccec746e7170cb777763d611ce999a62a88834cad07
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to malicious or compromised sites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://semineebrasov.ro/printuri-fi/files/fomubikukisebuxo.pdf In PDF document text
    • http://zonazero.es/userfiles/file/11580768933.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/90529084168.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/17643565589.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/jogiziporivuwipitan.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/dizojuxe.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/234741d4535cc247a52f2c3849dba71d/sunenaturinisenojukidopo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/8401231421.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ag5jjrm08jge72lsm23a3fl1p3/luzonab.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/3605664918.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/61386787670.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/11302623682.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b0033bd51---32521271801.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34f8e6185---lakunowowupakexogerobal.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1aa195064---19634638366.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/febf5c04ea21a56e5aecf7c6181777ec/momumonefefawak.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f387be0ff0c---26186367103.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/574f802a2066da5becf5497178250152/tefef.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/82221498121.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/nojeme.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160887f8b4c8f0---65591692244.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/44192734168.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8906c22293---86970458565.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/716qe1vie29ojeh4fr60ejqq8j/24612648979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=recorrido+liquido+cefalorraquideo+pdfPDF 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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 10532 bytes
SHA-256: 43b687dd557a2d8778dbf6d2312a5be7d0c02ac7b0ba972ee15142f87558d766
font_01_sfnt_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 18208 bytes
SHA-256: 41196a988d4251008785861e2a4fb8b6fc3bd22e4db2daacdeeb22d21a2f94d9

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