Malicious PDF — malware analysis report

Static analysis result for SHA-256 387fbf44f7f87e07…

MALICIOUS

PDF

295.5 KB Created: 2021-07-05 11:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14e181efcfe3256837e46784668ce8f6 SHA-1: e8e1df97b9c2f348754896f90ab18dc9f768f64c SHA-256: 387fbf44f7f87e07a8b194ff314f0b8c70586d4f50deff1d52d15b2f8ab9bc08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains numerous links pointing to compromised WordPress upload directories. These links are likely used to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the detected heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

Heuristics 5

  • 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.
  • 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.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05301cfc8---narigixirejake.pdf In PDF document text
    • https://tappowine.com/file/gaxivoxezu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/vifuzumanukexu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4c770ca7b0---voziviperewewoduj.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee63f62ae2---77768806733.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862e8e49694---20746485381.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/92309312015.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/98130969381.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d56e9b8d33---90235460492.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/29592761475.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb880d9675---vaxiwegoxuvad.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/518900386ca1109aa3935ed28a38ea32/55854580468.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bdbc3c1a1---59058192567.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/osftekgcldsquma9362652kbf2/39934126631.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a358f69f74e---68556380422.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/bbf39b4a61b782d5c1e1d10c4cda932b/5993812398.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68714a1f1---dajowoxozusofogimutonu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e404cc54d---zanejujeze.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/selarugafu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b28ebaa244e63fab0a96e77d11af7c29/12139266048.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/51354030877.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f434965945---36552880866.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021070405195270554.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/3cb6991d3f0f0a6323b686135341bfe0/vabibokawilutaxelupej.pdfIn PDF document text
    • http://mousike.it/img_ins/files/67367740391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=computer+boot+process+steps+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00041e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41E5F 21156 bytes
SHA-256: 9f8c4db8f6ae62548ab5dbd731a644f8b73b87ce19f74b293e149da76e8ee580
font_01_sfnt_off00045622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45622 10648 bytes
SHA-256: 5ec0c68fbf29c720f0feb7a944b137683e5260c07b1dbb60e137fbca8bac9de7
font_02_sfnt_off00046e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46E54 2144 bytes
SHA-256: ce39cd3d119ac5bbf84a393f0f7732a4c50b926c98741f90ee89733a1ab3c11a
font_03_sfnt_off000477cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x477CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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