Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2032e761bbbd547…

MALICIOUS

PDF

89.8 KB Created: 2021-09-01 11:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c18edab84965429e5bd293799fa0fe3 SHA-1: 74d2205478ef04e5905d415bf4f2d9a41044b4c5 SHA-256: d2032e761bbbd547a494447e6d3fb520ecd5853f8b7d6decd0bd9c0f38aa6db6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=how+do+i+make+tnt+in+minecraft PDF link annotation
    • http://rund.cz/UserFiles/File/93291477884.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/144d43814096562d0b0efaa17efcabdc/sewixelino.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/nixejuwo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4b2e0094---gajivur.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/mudavo.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/ruvevudozimezedugefa.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/69940072472.pdfIn PDF document text
    • https://ienter.bg/files/gipezefamojibulijawapogo.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/431eab6d79f59e028160fc3d9ad0e30f/51614734996.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/talan.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/51803477618.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/74824220775.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210807_874B181733C228C5.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/38526362568.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/wixodutunefuwinutajizexiz.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2fd4f2e994ea762d2d150b9b1b0e67ab/zosodagomisaf.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f59748bbe---80132593072.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/tudedemuzigu.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/gawamuv.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/35414112101.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608786f596124---70453669558.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/4560527818.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/tezemuwelobukevigajo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075346b7a854---pevapudijodiwojobefipaja.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_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 10592 bytes
SHA-256: 7fc9641907d837b4d2219d3a901f267b65e10f6a0cee2cbca07073284918d896
font_01_sfnt_off000111ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 17596 bytes
SHA-256: 2b757f9c36e2755a9e63628db386340253cf5eeea4644ff25650eebe68fb24ce
font_02_sfnt_off00013fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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