Malicious PDF — malware analysis report

Static analysis result for SHA-256 01118eabfaa0b9c3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 14:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bec35a43bbbd43ee228ab53ccf41ca52 SHA-1: 68e83412cd0a436ec7b238b3d6c9e907e55fe034 SHA-256: 01118eabfaa0b9c31803ea3dfb5566d8c2ce9363b5423781b0358d7002c0691f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the PDF structure suggest it's designed to exploit user trust and lead them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=restore+keyboard+settings+android PDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161313c3fde718---47757883962.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/mofepi.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/68261185764.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/5691122263.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/renosupoviranemigugovozi.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/gebaluwotu.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/36326271697.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fisosapa.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/senufovutix.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/jekaretelaretiwaxuzizufu.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/xizalarapujekekujojefimob.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/rikerek.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/33586971132.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614be74be18c2---veseke.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614058bfced71---terukozokanuxabugapilu.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/62208731343.pdfIn PDF document text
    • http://mweb.cz/images/file/fepovoperatog.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210909_121402.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/54526170203.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/xejukenasafed.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/56671641499.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/42906969679.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/xibedodigarepuzigesusi.pdfPDF 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_off0000b1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E0 14828 bytes
SHA-256: 140bc4f0ba4233ba4bc7bd5284f18254d8b00968698eb97b7061997109b8d4e4
font_01_sfnt_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 10768 bytes
SHA-256: 9d313537bff71595604deb595754f7ab971c945f9e46fdbccf4fd3d612feb82c

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