Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4409890df46a5b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 00:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11f1ff69fd485602668be2a9d2be080b SHA-1: bc3339a6c74b3ac0086f1366cd8e0ea0e31e420c SHA-256: 6b4409890df46a5bff4db5d6aeba65a2ef3a8ea7874309e09ec79f9d24301271
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to other PDF files hosted on domains identified as potentially compromised or disposable, suggesting a phishing or malware distribution scheme. The 'utm_term' parameter in one of the URLs indicates a potential redirection or tracking mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nikoljski.com/ckfinder/userfiles/files/75335008375.pdf In PDF document text
    • http://attlas.center/userfiles/file/kojigadijafijovod.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85095926070.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/jizimiluribu.pdfIn PDF document text
    • https://ms01bet.net/contents//files/14403160197.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/nisumozikadijamovujo.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/92273570577.pdfIn PDF document text
    • http://indel.sk/userfiles/file/43246369355.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/67240755003.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b3db3b11f---kuxotutegudagimuselaj.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/72021187602.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mu84h6md846n6d6cugq5jfu3s3/50048861140.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/dagisidovikow.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10546f3fb1---90999496230.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ka6aru69smtft00bleud7lk3rn/vajelugawifimifis.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/4df942e48fd59490d88f79f37e4c0ec8/8285128453.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/64381354933.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/bovemuxurup.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/ditikitezetifesadewed.pdfIn PDF document text
    • http://sparkpro.lv/content/file/87195709299.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/210e514017702b847a694ffd16ee6bad/dudazajakakiroredager.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/3c7b52fa3c060594d6d06ba3ced319ef/fevenedibowaforajo.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/33e36a516ce4f47ca6844568f5ff9ab2/3823463632.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/52491107455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=system+hardware+architecturePDF 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_off0000b861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 15992 bytes
SHA-256: cff969a63bfc1c7ac1b0cb23f753ca18ce7e0239df2c0d254a99812755cd9231
font_02_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10740 bytes
SHA-256: d71a5efd9f361065d51ef2c79730365a92860fba1005e9557688bbb3a149dd3c

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