Malicious PDF — malware analysis report

Static analysis result for SHA-256 533688e90dd1960c…

MALICIOUS

PDF

87.9 KB Created: 2021-06-25 19:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92e62b5372a5c3ecefaa529376eadba4 SHA-1: 5ac9efc0a487754f4c2a99b2a0d8ce2eb7a82d82 SHA-256: 533688e90dd1960c7a00c815b2e06c9d04bf556e78d21599e795fcfaac866abd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript to facilitate malicious actions, such as redirecting users to phishing sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f94b8164a---27646844359.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a4884d8e25e3961eb6637b6e5e4454bc/kuserafolesito.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb791edfa---25627838009.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/78cf8a235e9207daf0d3822cf83dab9f/fowalorilapekoxor.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/48746075431.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/neworubevenamusuta.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160942aaa5ff19---77131160499.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/53829497059.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/87ln7lcpgmkoukqt4bhrboail5/50460946576.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/lirumaba.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb3a6a998---31493648391.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/favurudazemakedijobatowa.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/i59cclm1kvkbensgnpaq5hlv8h/67030162370.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/327242eeffe11578f8817ed6695f9e8d/52685475598.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3083dc67300c7e6a47e0dd4e6f024f86/46367072142.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/44404213367.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/minusuribak.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/nimumorozo.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/piginun.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/xotimoginotesozitodexopa.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/77149994394.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d376d83b2a---69447073993.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/52ef76d3b66e3466349908d76683fe2e/fovafunalanadivopudo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fivelodobebitixesaxapiwom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=watch+megalodon+online+freePDF 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_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 18320 bytes
SHA-256: 29a573e27a51be23f942d223485e19d59f019b9252edc0c378668995579be6b1
font_01_sfnt_off0001209a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209A 10748 bytes
SHA-256: a8ad6a5a223fb5dd107ad2429c16aa3d21d2355253ef67cab110b11584b880aa
font_02_sfnt_off000138ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1