Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5ed43094de4940…

MALICIOUS

PDF

71.0 KB Created: 2021-09-20 20:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ed2b89e7c9528ab3c4ba0e3039cf54e SHA-1: 277416c672711fdd26d39c4a7315502417353ea2 SHA-256: 1a5ed43094de4940db67c305328e92eaa11ca17cb7143e9646d1176203a65679
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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://nomylo.ru/uplcv?utm_term=triple+town+apk PDF link annotation
    • http://geomanteia.com/userfiles/files/rexemab.pdfIn PDF document text
    • https://ka-base.no/images_students/files/jotesij.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/22608886087.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614766ba1c508---vunixerasudasajum.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/20177366871.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/luduwidubogarukefozegosaw.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/81574140152.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///gimubemidanugazilu.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/82913399527.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/vewag.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/kazimukiniripi.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219112231232010.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/11972220737.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/22158357402.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zonisolutegan.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zakajenoli.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/79285809656.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161340646b53e2---7599222110.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/palesexodebanurepuj.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/s3d670p9f8rc656gruru341e9t/24959787213.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/bisusemuluja.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/jopemutepalojufozugalez.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/67896087374.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/56266b968d38bb10dd5af364d753ea0b/finigolekobasetalosopo.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_off0000b733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB733 10220 bytes
SHA-256: 1d0df981d2e3e5280f27bc4fb4fe3024e4e6ef87ad81da0938483a992341c80f
font_01_sfnt_off0000ce44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 15760 bytes
SHA-256: 9b66b56f4fad03303916116052e9270edfb8dec01a33825fb9163bd9c6ce9828