Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a53064890b8428…

MALICIOUS

PDF

93.7 KB Created: 2021-06-28 21:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f05103cbcdbf32fb810fa929a842c23c SHA-1: a1d7cd0edaa2992faf8c86d465ff8e7ba2576505 SHA-256: 81a53064890b84288d5ff737ddd3a3b16c07b176aa662396c2f67b6bd2fcb7cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=mathematics+form+2+chapter+1+exercise+with+answers PDF link annotation
    • http://www.predia.cz/userfiles/file/xokepotamenibukivukogike.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7dcd42c4b---25763274420.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b99be0767e493d873a35057c08ae2a25/12775764483.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1kuqoo6de0o5oemjv4g4ukc480/27629043235.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/zunuxatuwij.pdfIn PDF document text
    • https://davaocarrental.com/images/file/95735063117.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/venewoba.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/depofaluwopodezage.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/situmitujekuso.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/35654449774.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/01pl9idc59if2fvdjl6rnn4m7g/62201644854.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14e7971e1---98528906296.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26adfe0264---44376946466.pdfIn PDF document text
    • http://amandamaitland.com/images/file/31471740578.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b7ccf09477bf28802ef17b6c456d9f28/bevisufen.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a2b8ce9f---14453408678.pdfIn PDF document text
    • http://idroter.org/userfiles/files/76059208772.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609358cdf2dfa---50027809167.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/50669005896.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/fububopivuxamusi.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/begedaxozisotanilumesif.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/892704b066ae6328a2abfe28ea47e7fe/75596681303.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/nuwasepadiladilapovewo.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 16120 bytes
SHA-256: 5a58bd25086e93d985c75a25ed67f4dca879ce5f42e3fed3a71b5bf37e4b09db
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 17008 bytes
SHA-256: 9f6d205f24a84464d6236ef37b1a2e75c2a4b94da8b771f541bf18ce6e312a53
font_02_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 2800 bytes
SHA-256: 88ea6c3c08bd27ebfbe28918db673fa69d041d5ee3139a6bcc840735d4757818
font_03_sfnt_off00013628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13628 11052 bytes
SHA-256: dbe1be461bf54ed9271a4ba3d34e858bcc79aa7f4aa7c6a46b2e40fff0b054e2
font_04_sfnt_off00014fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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