Malicious PDF — malware analysis report

Static analysis result for SHA-256 3420a9894e8bb0b3…

MALICIOUS

PDF

94.7 KB Created: 2021-07-21 14:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9125028a4c69526a2f03ea6c3df7b5b SHA-1: 7b28bd49c6ee81f322bba85fd6808e6220ca6782 SHA-256: 3420a9894e8bb0b36b61be70d917141844c0037981c92028ad185a302db71490
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/e1f097601946e7a1f0d8e573603ca276/75478172654.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5baacee4d---boloxewumibid.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/sabiwurepojakazaxakef.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/83551761607.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe23bd215c---zujoziturafuwepivilulita.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/egdstfmk8kem4jbgtugp125c05/butes.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f5406e0a62---robosofepakupeluberutorus.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e553ab162f---kakomemudexotapuvosag.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/31581169732.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/wugunuli.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/pexadedupakopu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/418ea0c2df2827468b447800f0f3292e/wozozukax.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/kimisipirujexigerod.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607424c1c778b---dagazepodeve.pdfIn PDF document text
    • http://ledins.lv/cms/file/dovazefejepuw.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/zikipinodub.pdfIn PDF document text
    • https://bem-sa.com/img/file/wowurikilozerizomurawiped.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/kknkjrhogntbiek6j73jkcc6la/46363849221.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/zedadupoworikul.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/wokilatupibagigowakut.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/89596419463.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/s5gttd3h21nl7qqc21q0kfsco2/dawijenuzubozexesu.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/71115289932.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7kn2q5qsb3qg8c5qc27cbl5p3/jaxetanidi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3oj97v2pu95gbdv23g2mitdup2/dezalebibada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=2016+outback+owners+manualPDF 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_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 11084 bytes
SHA-256: c0e24461eec1efe31fd3f211bfdfe3703913d446ee5e3f906624323d9deafe96
font_01_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F24 17428 bytes
SHA-256: a05391fde2f275828da79b7ceb00547973eadd89e5036e670230c30b584623db