Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d799f962e37b71…

MALICIOUS

PDF

110.3 KB Created: 2021-08-10 06:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63bd38dbe5df455f88ed0dc32c48186f SHA-1: 3b9fd0b12dfba2d6e6fe4d9d08ab78ba89bb37f2 SHA-256: d6d799f962e37b710890ecb6b4f54cf2936ac4c7f60faea69e019d49cb6607a5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1f970f646f2d42e66f70da3b090256fe/gigulomi.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1fa58ce34---forijetimuvokuvutabokimej.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/tasuwamaxebevik.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/dawimeg.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/zasipupuvixulunu.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16110e2e738b64---vixor.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/4394335284.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/p88q4lamt7n11f3p02t1q7uvlf/gipekugalinibap.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/sedokobowoxabega.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k64qi8sj5tromcpjjm68op0qn0/kefatobusafusubufavowo.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/tavakekelofubode.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9de8225694---16275817962.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/92c3eb3b1d06f4e8058aa16c6d8e62e3/porelerasaw.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/sofemilebejazexederurog.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb091d5b64---65060477623.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aeb90528c---nulexifoluvoru.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/iglb7e5apkvh7ddbrs47125ru8/wawamufi.pdfIn PDF document text
    • http://slsnn.ru/content/file/70686364742.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/95596243558.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/kejoru.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c23e1b2f5f---sadabazuliwufanovelaku.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4f3b903c3ba7269218b99dad36a80f38/37545428200.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/178e434d196b755626577588deb07390/vorerodekowanetepamivu.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/fuzofuvovamufolavekepon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=modo+de+producci%C3%B3n+primitivo+caracter%C3%ADsticasPDF 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_off000146b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B7 18976 bytes
SHA-256: 1d53a385e9d3899b8e41f9679103bb936911b27cf4f61d07fa63f8570a6c4822
font_01_sfnt_off0001770b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1770B 10988 bytes
SHA-256: fcd69be3a3516459a091328d648dfed40e585c5befa0e01930a8cbde024208fa
font_02_sfnt_off0001904d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1904D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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