Malicious PDF — malware analysis report

Static analysis result for SHA-256 07570b491cec3d8b…

MALICIOUS

PDF

91.5 KB Created: 2021-07-25 04:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2920944ec3f652fddda1e1f8c8f8ad2f SHA-1: 82cc256dc9f6429bae1bdc5e83e00d9841c87ee7 SHA-256: 07570b491cec3d8be11f4e09a43aee635ada465a77b8fb07a292538f520d40a7
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to distribute further malicious content. The embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6fc880275106db0823ff454ef555686d/lifuzamuwig.pdf In PDF document text
    • https://dafelia.com/files/sumitoliguberaritifitipir.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/76318794459.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/93168536918.pdfIn PDF document text
    • https://hoongnau.com/upload/files/pilotawexakaputexid.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/77460477703.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/54471428648.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/86257fcbee4a2673148b6a1641c71c3f/80185831836.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/g8nbrc89ue8cdptujvtq81m6ks/koxoxix.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/pabeviru.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99978362211.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b465e9b4e9f---75870270714.pdfIn PDF document text
    • https://synersys.fr/contenu/file/gagiwugawedipopaxe.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/89007014550.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4670f8e5ebfbb6574c901837231f94bb/lemivovoxeridevekijokose.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/63101640567.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/13825972866.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210626032336.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/eb4cc9c78dce475ad4bf1834ff2b824b/nubive.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d564ae42e3---malorupogigonobokijir.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/72386070065.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e0a0e8a7---13554987405.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/pabajepirajibate.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/97367017503.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/mupaxelivefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+activate+hover+1+hoverboardPDF 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_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 17548 bytes
SHA-256: ddaaa431a48f5e390338e104c3348d6ac42328dbc80ff7e2957666623af6a01d
font_02_sfnt_off000147b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B7 10484 bytes
SHA-256: ef2781e79c90f43f6f05a3962b0cfaec63d9daabd7c16ce4ee350cae96e435fd

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