Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3372f5efbb3bd6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 23:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bcebc2e1f830e433dd3a79f13c1c2089 SHA-1: e2dd7258799a27fe3e3a49ccf8507da626979325 SHA-256: 0c3372f5efbb3bd655999ff89f4111b82438e82bb412923c67f614face9c1748
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://trevelsi.ru/ckfinder/userfiles/files/19774264669.pdf In PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/e27126bf5e411b17232c2683d8bd3f32/jorat.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/tepajumidazizomusoxudaxa.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0c3444b0b---56954400072.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/nopafag.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ec99f5dc---kaguwodatafurukenaboge.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/0neiqin3r9dcmsd8kmudlcg3ru/46369784733.pdfIn PDF document text
    • https://quizai.com/uploads/files/xikotenerexojigerofowener.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f47d3a952---65685165832.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/crr8epjeg07lbej14913g600ul/13048346955.pdfIn PDF document text
    • http://tid.vn/upload/files/lexifapitipevepuweketiso.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/78a1c69683acf152214e5b365bbafaee/jelubawemujevaripubaxokew.pdfIn PDF document text
    • http://csavarkompresszor.hu/userfiles/file/77299966638.pdfIn PDF document text
    • http://metabolit.ru/files/file/79246161554.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/jamozazobuzuji.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0d78a08f---34396346402.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b88f337d---tizeretupen.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ee6c939e198b8703402fe72731566ffc/60607419189.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d8db2d21---pewapuz.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/penan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=french+irregular+verbs+conjugation+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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 18940 bytes
SHA-256: bdf46104df9a9d6f6a4b78df979b623d9669c15ee45e352f3820fb5f8448e98f
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 11312 bytes
SHA-256: 02f88f907470b99cf6489082e96d6df7874d63280e37c629b106b24a05804b27