Malicious PDF — malware analysis report

Static analysis result for SHA-256 940a219afa304fd5…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 20:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a764fa464c82b2bef317bc559a2fe974 SHA-1: 5cceb590999298b8ab4d09d79bd2654805e7dcd5 SHA-256: 940a219afa304fd5d4d99ac6da6d8489ca664c185cd54f20b4223ba840cccb81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple disposable domains, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown reputation URLs strongly indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://serting.eu/userfiles/files/89541426378.pdf In PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/22483552857.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/fidifunarega.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/dafoxeti.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1f93005bb298f4fe0411b61fcb636600/selilabexenaborasesajinab.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/jidimetajejavakakalix.pdfIn PDF document text
    • http://usateatop.com/_upload/files/babosaluk.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/sojebimivigaji.pdfIn PDF document text
    • https://hssanesteban.cl/files/datinakutagozuxotonefed.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/20305823637.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/61872127078.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161438bc58936e---8083219290.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/xujok.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/80351882853.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/36966308652.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/73498844919.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/98055017857.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/jawifasuwifigi.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/foxifetulifatake.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e849862c76---90610866042.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/wifebojakitaxebeze.pdfIn PDF document text
    • http://mrybalko.ru/files/zajuwadonijubesode.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/pevumusazomasejavigibomeg.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/gojuzerepuj.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/12912216357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sims+freeplay+versionsPDF 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_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 20180 bytes
SHA-256: edc9b2ea41d8ff34e70143bdca8f31b633b8af4d3ab6aea854dbd3a2ddd5de41
font_02_sfnt_off00013165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13165 10676 bytes
SHA-256: 402b247ec0e02495cf0c50065491ae5d2e0bde0cd461b00770e24603d0fc8c26

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