Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a083147b86d198…

MALICIOUS

PDF

74.8 KB Created: 2021-07-02 02:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7dcc89947ec184b9123cf3f5c9354e6e SHA-1: 67f9061b452d185adcfa5d43b06c9921953a5b40 SHA-256: 35a083147b86d198948f58a4f7cdc08c2a62943b408acec3aa5190ff92001f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attack, potentially leading to further malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/45c5ff0de1b61787b8b0b30fa20a8a0b/jokafubapimosojokipaleziv.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4a7184056ea07ba4eab6f50f009e6ab5/waxofidojenumodesiruzebu.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/54042798121.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/fb6e4fd30c083f4656c18a974b2cdf90/bogagaxezonojoxelezifo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/t360qr463ngk9unuliopam3bsu/10769319479.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d045417071f---57718168603.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/abc7ad002d1e17fe2f1bf348b597ab50/mibutuzobaranagesizaz.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/prsn7k11b0kq52cnmg3fbj8pi4/49022848078.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b19de36006d---41769975355.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a43441d488d2e675771333fe4e419d06/88743326377.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/47307429b8633a8c59cd631b96fb6992/zodetizaretubafofo.pdfIn PDF document text
    • https://latework.cz/soubory/zulod.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/na3phddcfct3lbav5nsginmjhe/gagonajomumiwilelijix.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/80557740567.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-3/20210603125941113997.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/34636150510.pdfIn PDF document text
    • https://ancoraeducacion.com/images/sumajatavixidetatafo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce0719d68d---2721829679.pdfIn PDF document text
    • https://afayl.com/userfiles/file/zevoxu.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/41224661130.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/21798725983.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/45594260697.pdfIn PDF document text
    • https://tomas-music.com/contents//files/16977687936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=star+city+football+pitchPDF 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_off0000bfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD8 10500 bytes
SHA-256: 7d7187ded4b8fecea57217cb125279fa242b79a2d57a79311ba46dd4b5883ae7
font_01_sfnt_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 17808 bytes
SHA-256: 68036d79e4a4a3a11cd2c4622dbff7cd2d962ef8a141d7c08e88e28d6139038a

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