Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8afef8e366ed68…

MALICIOUS

PDF

86.6 KB Created: 2021-07-27 17:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efcc3e8f18048a3a75210ee9b6c350e7 SHA-1: 6ddb5ce65893b15cbdf820d14da56af1a6f9121e SHA-256: ea8afef8e366ed68897c7ada715be7835ab431f77e9f014b763edf85658860ef
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 it is likely a phishing or trojan distribution attempt. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or downloads. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ed5a4a9b---92477860843.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/34e3a24963844e310d6cf711a782f003/61702958566.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/3519181506.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/nedomuwovotukim.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ea68504e60bb2412a5af05654e36dac0/78603266760.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/33525924363.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1284874646.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/96ce673f83cf92a0bf12313c039de124/xodewotapuvopizo.pdfIn PDF document text
    • http://z500.si/files/11112489077.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/pojivusozarinexenonomo.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/dab11794bc50487997c97d2e4dd191d8/61267706758.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/razimexokuvulizugezabe.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/98491119538.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/4548a8b7ade514963e8cb04ec1214858/16950560538.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083929f095e7---simebenimekininazejuzas.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3b677cbbbd6ad1bc4e6c93139d6933a4/jolozikekoza.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210613_3778A03827DCC70B.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9e41eaff17a5e7e7e4d03f01dc8aec27/mivatonuduwexubodutonux.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2d6cdf40c141f286fc259552d6d8477/53255872817.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/75049249106.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160720c9c71f7f---9951021495.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/75053dfc0a10671f6330d01a325e65dc/39960136292.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/xibukigoxuxibaxito.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7nap96gb7ggk9u4a8d6kt9b9uj/84856608235.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/85488246678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=yamaha+ats-1060-r+manualPDF 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_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10488 bytes
SHA-256: 85421b561ab1075cb60632375d6e57cdd9b219a54e81b0e5d21fdb0598fa6993
font_01_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 18140 bytes
SHA-256: c4466402c41ccbcb3ebec43c97873daf2515e3bef4022166944aa07b6988a6df
font_02_sfnt_off000134c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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