Malicious PDF — malware analysis report

Static analysis result for SHA-256 894760f3c4ffa4bf…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 14:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82b8c27221e432374b5ee01183a9e35b SHA-1: 9371c1e9a9b792bcadb6f5541795991d6a275b90 SHA-256: 894760f3c4ffa4bfd14295532449c8f0d25a107b0f1d02d216f861f5ed79b874
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://semangkabiji.com/contents//files/xawotusakamizip.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/50723534763.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/9953392617.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e873309e---74508796473.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/98c470bfbe59329edafcd69f6208baa0/89594481591.pdfIn PDF document text
    • http://keluargamimpi2.com/contents//files/25800705094.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5a92681fd---87747212564.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/48828970188.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2u6lpqqn12h7vem4ftm2i34q91/38946974170.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6d63d6d3---zenopapukis.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/jesalabukaderuzedajeg.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/zafipurukob.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/21582316494.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f38529a23---lagijogison.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210623132215.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/fonenatulilawa.pdfIn PDF document text
    • http://mytaylormadefamilyusa.com/clients/864113/File/38711631716.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210510/210510025257770152ffbdr0ejkhlw.pdfIn PDF document text
    • https://sanidom.pl/img/file/puromadiki.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9a758c92---97528846111.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/sabepes.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/61fb43d888629de36947fe6370bb35fe/nopow.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/1186232a9dd47e0bc8ebcdc76f3a7eae/modizonuwosoferomiwasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=protocolo+de+estambul+2018+pdfPDF 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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 18616 bytes
SHA-256: eebf751c969bed2f0e51a53d2498c000f6c22a88093d9138c70845a900d8ad2b
font_01_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 11328 bytes
SHA-256: a5f985f6d2a1c23f75a9e65d3555cc10554acb34581bf7cef77cab27300546a9

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