Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9aafe03643ba461…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 18:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 541b9923861f529cfa0b1ef7b845cde3 SHA-1: 059c143a3ef5031172fc17391f1e8ee2ee41042c SHA-256: e9aafe03643ba461b401dd959043cfec796fb4e8a8e29195bf70f23ce150536c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=office+365+onboarding+portal' in one URL strongly suggests a phishing lure related to Office 365.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://queure.ru/uplcv?utm_term=office+365+onboarding+portal
    • https://psychotherapie-coeppicus.ch/userfiles/files/91403789761.pdf
    • http://sciattella.net/images/file/wunexubepumusarilukefas.pdf
    • http://solmoda.it/userfiles/files/57332103097.pdf
    • https://laptopserwis.com/app/webroot/media/files/52154948191.pdf
    • http://jfac.kr/ckfinder/userfiles/files/xoxigarizozofizotizarur.pdf
    • http://imdmotors.com/uploadfile/file/2021090721482455.pdf
    • http://marinda.ru/pics/images/file/15962251591.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/569gg1tlbppua108d1ner4pu90/gojuwaboduzoboze.pdf
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/lesarigon.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/donasugobetuw.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/39109215667.pdf
    • https://bold-iot.com/uploads/files/202109041121491388.pdf
    • http://matchonusa.com/uploads/files/kotejokaliso.pdf
    • https://lee-trading.tw/archive/upload/files/tenun.pdf
    • http://hyundai-dongdo.vn/images/files/wenotanejedewexogodago.pdf
    • http://capmar.eu/userfiles/file/sojenusopiwubokajes.pdf
    • http://papienbanana.com/user_file/file/47204329920.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/daxevizonavolumized.pdf
    • https://esprimagroup.com/userfiles/file/jijefukukigifitok.pdf
    • http://biancoacolori.it/userfiles/files/pitolejilorem.pdf
    • http://elfobchod.cz/foto/Image/file/8931793754.pdf
    • https://sikahaiphong.com/images/news/files/futafumivoloram.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/oibdhn5krjtgdpe9h093eca2vr/mapezetujevude.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b8.bin
57924b7b28d7bfc3887093e133d4f42a43b13abde95279a18d36a8a2925057e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B8 16608 bytes
font_01_sfnt_off0000f4bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 16792 bytes
font_02_sfnt_off00010cd4.bin
76ea92290e8d2d45d3f7e92f2b9d1483ca98a705fa66057103ef2f76604df52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 11268 bytes

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