Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ee9fbd1755f95e…

MALICIOUS

PDF

88.2 KB Created: 2021-07-05 00:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b65447099c438f875ad92c9893411d48 SHA-1: 1f37388cd0844188deec91e919ba0b4f5efdb410 SHA-256: 98ee9fbd1755f95e30bac6fcb2cdf938beb6bcce64be8da39eb78f82f3b6db1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no executable scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for its payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/df4ebb1ec5476af5adce0d3c77a255d6/gigudabi.pdf In PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/46f681941a8d8f879821f84f839b5bf9/wakopor.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01f555776---nalidulafesuxama.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///19090268401.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/63418433614.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c04e8fc3e70---mamuriginavil.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c2f7f482a0fcc80d636f8750e667ed4e/fakuwitovure.pdfIn PDF document text
    • http://vce34.ru/attachments/file/nakawuwexurobusekaka.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b84ktlpc77j5hmbmhfv0t706l0/84338533227.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ov8elbfgmdrci1u2iis4fgpjnh/38036454258.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/dokixinijajeris.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/7996731343.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a5c70a22cf42345e74de011e56e652bd/23371098823.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/dagexirebosokedulazaw.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8ikirnl53ds88bbrqng0ek5r8a/movezuwozuwozu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd60c9e15---91771738275.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b44eae604e---23030549223.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098563f8c0e4---tosimibexeloroki.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/guzarejibiwadabofujulozo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1363d9cd---26441316059.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c1ce4faafd330707ef2cd579aec39de8/ruxuverijug.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/kovijadulutuz.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/92348378073.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbd98cc29cc0ae66148e8d559c71e5a8/zajororarem.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/70154424218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=therms+to+mmbtuPDF 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_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 10172 bytes
SHA-256: 25176b2021a3ab3f5175fb24241e09f5a58a9f1cd1e9a9c173a802e5509813fe
font_01_sfnt_off00010977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 19176 bytes
SHA-256: 1b23398af44a7e0245f2bd6b818bcd58e39f0fc1cc6d09904626d01e311a63c4
font_02_sfnt_off00013bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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