Malicious PDF — malware analysis report

Static analysis result for SHA-256 b563e2425a9a011a…

MALICIOUS

PDF

94.7 KB Created: 2021-06-27 03:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 078ca2f6e99d62a6a2bf633b446376d7 SHA-1: 9375919d21a442d232dad2e907cf7a550cbf74ea SHA-256: b563e2425a9a011a1669e163c2a46241883a2b5104cefb9cf64ebea94d63be9e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://krisoc.ru/uplcv?utm_term=repotting+a+fiddle+leaf+fig+tree PDF link annotation
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e486049678a592e3fe7640069838d679/59364098349.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607624e78335b---2190345823.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/c28h3l8ec6se3542n79eiti7d2/vomapix.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3db7f670c1c2678aca3a671a0ed42d83/zenajagarikitotirusom.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/85023922883.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1696659b44---menalodazexi.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/53canhpeh27rjp6tq4gr2tipk1/92721353861.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/tirolukab.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/22030673907.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2fba10e2912d8240bb891a6b7859a693/rapuvesixo.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210531100134840.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abd4d2e4c3d---roduz.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/gobovevomubovujogake.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f300558fb4---kinevefititi.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/97436890891.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff566be733---mopud.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/kolosefurutolisodenu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a838ae89b218ef28a67f31f23bdab92e/91699393296.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mi3mmj58og8p7mkkgnmt508r37/92627671565.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994d15c34fc---zegagojavuki.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/psfk994hjo9s0gns9br9b8nrg0/78059856982.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/10d66f0dee57007ee9e8e4912572969e/jefoniguferedevusogo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 10548 bytes
SHA-256: 35da9bd7309ca71dbe5d5f3f99531ea7804b25b8c2af259c5972d1f907c14b0e
font_02_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 16496 bytes
SHA-256: b20089f1a4b22753078ee28bb3eda6f80432af3f7e8258e7bdaf5ebc57b37eee
font_03_sfnt_off000155a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A4 16568 bytes
SHA-256: 4ed47fca4feee7cf6d1d740501711e74290ac7573903465bfc99d115b791e56c

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