Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d726b51702a42a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-11 21:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1956c643f4341ef1ce2ebb884c3f80d SHA-1: d47ee26720d227efa273d0663df31dbbb139c06c SHA-256: 66d726b51702a42a8d4dad0f258870178da39131ddab59f73cef9b729bc44520
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. While no scripts were directly extracted, the nature of the PDF and its embedded links suggest it is designed to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://braciszewska-klimek.pl/fck_files/file/tujuladadevizesin.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613266fcbfd9c---pevapidadelerokisinaxi.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091115270373499.pdfIn PDF document text
    • https://esz.jp/img/editor/files/fanaf.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/jasefoja.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9fab8728---sofojedujit.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/71915099778.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/62453235787.pdfIn PDF document text
    • https://membermimpi.com/contents/files/dovunapamonuxewuk.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/79426677747.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/fikageminoxebi.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/famesefok.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/476a00387ee2e071966db0e7d1556d34/fojomuwofeporasovogef.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/15928988269.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/zukomagegokozetukatituko.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c912a1cdf---tixufirewub.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d26537d4146e409b54581af02224e83/kulefovuritesigugijupido.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zitofujazima.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/66617009605.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/jebepetadatu.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/15614032909.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/potarekiwuvopi.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/52075946303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+music+apkPDF 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_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 17940 bytes
SHA-256: 88e4f378af0c5059ee4f312e16466a7faef798528ac07ecb15ab105f56ebb2dd
font_02_sfnt_off0001304c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 10408 bytes
SHA-256: 2c8358e130899dcc8459879113646725185be811b6a7db7a61bd2de7be8c035f

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