Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cf80d017c35015…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 01:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5491f7c0fc0077a91930da2bd9c3151c SHA-1: c09f8339391558f6960168fada3d7726eeec831e SHA-256: 65cf80d017c350153e06f05ae98e53a7bb755a5bd5b0cfcd4c09ec4595c4cc48
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=batman+theme+apk PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9e3688c6---49660449875.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210905_23D6BFE5BD91C968.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109161047223462.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/sobumilelafosol.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210913204544.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa0ea2f3e1---21331392023.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/voxepozago.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/33520220775.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d3a4afd49---28720490136.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/tetapojafix.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/xupupede.pdfIn PDF document text
    • http://falerisztika.hu/tmp/66913570101.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/55518510235.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/potopuzuvap.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/xuxagowojazo.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/gimako.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/42391852732.pdfIn PDF document text
    • http://z500.si/files/74774346570.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/88621608880.pdfIn PDF document text
    • https://clubon.top/uploads/files/sitodiguzokalikuvip.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/30551425726.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/tozuzifanufezitoralavuvo.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/wababitekevotukojali.pdfIn PDF document text
    • 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_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 19176 bytes
SHA-256: 8d14495c6ec2b4e2951baaf43e72734d52b885784343cf4352b9eed99d06e3f2
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 10136 bytes
SHA-256: a15d95b9aca6d3d8e729f108154f2f122f499647e4957e71a1db3a746a47edbb
font_02_sfnt_off000117e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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