Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d56d68530910dc3…

MALICIOUS

PDF

129.0 KB Created: 2021-07-02 03:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c18d38a3562beb981f960c572fcf2111 SHA-1: 81bfeed2180186bcf8dbd6234a8e5ae85f391a92 SHA-256: 2d56d68530910dc34c7f9008b242b8e2f850b1aa99ccddb1be851af114f1275b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and contains no readable text, suggesting its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0d196d88e5082a524cc8f74c1e445896/lanasujivefafesimu.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f5716cc1669fddb52c21dd6dc6a0e323/zazel.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4d68980736fc4530cb1a8a07807abae3/kokunaredav.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609adcea560a8---kixagabivimazafalibalalu.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/60320006091.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/nomabulagajemotilowovi.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ce76194212aa7e4caeb04b259b525074/37863348383.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801c0e38731---dufatesozaz.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062700484270554.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/apmikd11q8i41d2he7sba23vjo/vikalazanekuxukug.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/400e15ca259564d266d4a266f0a7b32f/gutaxudegigabozava.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a37dc8dee25---4804343266.pdfIn PDF document text
    • http://cycling-software.com/files/file/66328152539.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/zufegori.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091052dd3ca1---kididaminivujureruzibu.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/xiguvelusuziw.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xinesobutifemaf.pdfIn PDF document text
    • http://ezibra.pl/upload//file/56265899842.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/94905828044.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922027a6c37---pukuf.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d434e0755---59052210501.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/74ikf53ursjhqn5196m6kb1b0o/81869393772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=light+yagami+holding+death+notePDF 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_off00017d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19552 7608 bytes
SHA-256: 099a1c3bbfa2c58ecf04f91750a517f8d37fa8c40bebfa71c921cf29de4e9603
font_02_sfnt_off0001adba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADBA 19704 bytes
SHA-256: a0c6d7c91488c3495627551b47dc10e28262906493b5bf29f8b1026de57dc9df
font_03_sfnt_off0001dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEC6 10496 bytes
SHA-256: b8076c30921778a5371abc9d0b80f6c5982900104ae62500a61b2030b7c91e65

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