Malicious PDF — malware analysis report

Static analysis result for SHA-256 d954c3677ad5fedc…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 22:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e679ff0461892caf02d232aac24e12a5 SHA-1: 82b7782070859e12c26ec6f254b7748c4e11b790 SHA-256: d954c3677ad5fedce44bae1be3cd18a31f528d037573d45ed7f20096ce76a717
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised CMS uploads, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=vocabulary+worksheets+year+10 PDF link annotation
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/giruvinefowowulevode.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befc4f72f06---33168824054.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/92814110510.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/44d386c25e938d2e8427bfb37ad33cee/68892648912.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/mumifuzuj.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/60058359499.pdfIn PDF document text
    • http://feast.to/upd_file/96142970500.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81a4364dc---zubosorunodinezu.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/kekidapolipemigur.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa66eea1592---vasasukuzadudiwa.pdfIn PDF document text
    • http://leton.pl/userfiles/file/70677128760.pdfIn PDF document text
    • http://cartopack.com/Images/file/42165129080.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c62e8f0aac5---gofig.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/74615437949.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/banugazapaxajuworepibif.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607550c46f669---42035680263.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/xiloxagi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b4fb89801412d2243c6633b10cdef59f/nagunigopo.pdfIn PDF document text
    • http://gnox.vn/upload/files/xojedesasedirudufi.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/38107332791.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/94247466789.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c51ab6ac88b---zizepudadorawulakoda.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_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 18248 bytes
SHA-256: 8dd41645f5da7b088e7717c201582cdfe1b2320898ae6e0cc0f308a2dac416bd
font_01_sfnt_off00010ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 10804 bytes
SHA-256: b99308b03984d06605541ad88239672f9428a1f34f96c9d4f6c1745d31946188
font_02_sfnt_off00012627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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