Malicious PDF — malware analysis report

Static analysis result for SHA-256 228c6591f0f80ee6…

MALICIOUS

PDF

90.4 KB Created: 2021-07-15 23:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 29226bf0ed6e53a1e49deed1297f7ee7 SHA-1: 810b32e627c343a43d03eb1ac4c88d0e9252b35b SHA-256: 228c6591f0f80ee6a7d174600438c867eba9370b20fd2bf0f079cf29e33e4c3e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or SEO poisoning campaign. The document body was heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073072a8176e---33995630866.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/7ill14itag23tcehjnjd93jja1/13701384057.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b542b11cab8---84399966949.pdfIn PDF document text
    • http://clingac.es/d/files/bipatalijovavozetoma.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d912958081---zofazubu.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/zajaxezod.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/32352943950.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/wovubofose.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f78afac5---xogatabokadoxatutolaraw.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/zobamedenew.pdfIn PDF document text
    • http://primaneighbors.com/userimages/67659827183.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c84258144267fd6dfb5f5507b632db9e/vokevudujatafuvapubon.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/benubutakiduwufe.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef639dd666---kozaz.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/957a05a8f2ecc6120bf579032d78c6db/78180296895.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc34cf0ec3c---valimuzixape.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160946f3f613d1---gijukivaz.pdfIn PDF document text
    • http://centronegozi.com/public/vujiwexil.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/61708258048.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd03552ed---nivirudeki.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608136095493e---13268107451.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/lewefuvekuzepoxanededuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=all+halos+in+orderPDF 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_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 17036 bytes
SHA-256: 6e8fad2d954acb57b5ff224b52e328bdaac468f76c825d488ce9e8ec1cca8211
font_02_sfnt_off00014611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14611 10228 bytes
SHA-256: fa2dad1c41718e57e3b6e94dde72a100b229f2be2994390cc94f732792a725dc

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