Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bb449f5ba4c46d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 12:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59f5c13bce02d800841449ff2942bf2b SHA-1: ad2ef1ff4284322ee5a7d10751cc6116f20e0bff SHA-256: b6bb449f5ba4c46dd085937c1e533cb61611dba73387f5c76582af5162f4ebb8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for further malicious payloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9dd48aa3f---81811320332.pdf In PDF document text
    • http://ahsaipu.com/v15/Upload/file/202152325444857.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ac2c5feb685749a9eb4b51dd9387a5ef/68937529354.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/24853316409.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/45912314776.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/dc8f76210a2c8a094711d683e6dc2a0e/degidilixirikododetel.pdfIn PDF document text
    • http://tyextractor.com/d/files/tefejabagakeladesivomo.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/75982065795.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/38485122495.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35fb966a90---lilogoriwugebus.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210812034201.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/pagitasinizusemitexasa.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/sazomagex.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/34027572002.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210627_099599F7DEB6F2DB.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c2591ac9a9317e379fd5ef24ef331cca/42832714383.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/lelonaxadonej.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6nu00f7hpkfea5i68fs9jcdiuf/66477609544.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/72478291839.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/tobejuduzaf.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/618mbnofmadvudvjjmg9scps5i/zisenadamapaberawapo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a2078f3764e48b01d64fccb5b4fc5615/94452595373.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccba2c09e3---31359016199.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d8fe13dea---13787079115.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0bedf2c725a85118c26ac8be9448f12c/62294702820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ziarat+e+warisa+full+pdf+downloadPDF 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_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 19900 bytes
SHA-256: 965a34f28b69f5008011fb7b71c09975f1b0f507e065fc02c704e43fe2af0621
font_01_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 10640 bytes
SHA-256: e7592e142e8b6d86931f5f6e0b961a8b9c37aa4a9dd0cfc0e130582cd80f67d7
font_02_sfnt_off00011f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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