Malicious PDF — malware analysis report

Static analysis result for SHA-256 1474e9f604b4576c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 13:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dcb090d8ea8a7493b2afd48a8e8ce5d5 SHA-1: 957105c78d448ea41cbe78aa6f7a60c7aaa08b6a SHA-256: 1474e9f604b4576c2924dc6b970cb752144c1e105766381fc3390404f46f300a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://cructi.ru/uplcv?utm_term=low+pass+filter+and+high+pass+filter+pdf PDF link annotation
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b437cd7b2---21071003142.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/litupoj.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/nuriraruwu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210804065828762.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a36e9e8156d9df2706df0625337ee311/piwiwonexagunewujokap.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5908c55ce574d81e2bbf8aed10a82871/gosiwun.pdfIn PDF document text
    • https://proxus.nl/file/13034699158.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6dabaeb87---12360115624.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kefujanavowutome.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/86135060042.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/97610524722.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/govare.pdfIn PDF document text
    • https://mmszke.hu/files/file/28006770871.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca8338574---sosawakepubogisigalimup.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e77db105---98450848152.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/4914150819.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7fcd33d45d0d0fa88d997e4e5860c60b/xumakabupasozif.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/fujesap.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/pidezowopaxajovimazome.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/dukonukupazojilelubi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071ffe74ec1a---72399582950.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611c75da8eaca---bakujon.pdfIn PDF document text
    • https://guijek.com/userfiles/file/segimazulojiwomik.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb09c8768a---xikuzavumimiwefu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 10820 bytes
SHA-256: 98c468fa59be97eb37c234c3c22eba1aed8e4600bf366318e9aed752baf35799
font_01_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001102a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 17272 bytes
SHA-256: 884256c1ed0c6074799d14189acaa4dcda090cd5d6d35a51ef16cd882e0f4e7b

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