Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f70a17ba09ac27c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 22:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4334e4a8a7cd638d9ed697cf19b6ce5b SHA-1: a8b74543401670429408fef12475a7db3b996259 SHA-256: 9f70a17ba09ac27cba5243b08501877dfb8b3742cd6113e19cd0173bfe7e8103
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=ancient+china+world+map PDF link annotation
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb74751cf---bidifoxorofebivivamejepi.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/bereb.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/xubafanejiruvoboboluxuwej.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/zuginifudisibuzoja.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/wuzimemuwumi.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/vadijugegawikixupozepo.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/lijuvolipedegitiza.pdfIn PDF document text
    • http://come2menorca.com/images/file/watoderukemegojabeno.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/98449020820.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/38399233791.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/nejubugodelulufozonasixib.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/96134442ce702758f3ab0b77367a3577/49411866320.pdfIn PDF document text
    • http://net-marketing.hu/images/files/doradudexatonuxorasuri.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1cd77b2c---61658866608.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/busomakubelijegifuvamu.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/51944529835.pdfIn PDF document text
    • https://arerp.kr/data/file///gulebadoxubofolad.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/gf9sripje4q4cfaf3gefh04rd1/pubemelan.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7889185f---3134886768.pdfIn PDF document text
    • http://kotolantopeni.cz/file/putopejutopot.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613360deddd02---mebezeki.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/wiwevuvufawezufejuje.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/95350402533a7b51bd8b253c71788bb2/sefiwilewavemisu.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/regexiv.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/tubixufenigim.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_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 18524 bytes
SHA-256: ad180663d79814f9ab678acd985a46ddbfeb234c406adbb5112910d5ca35ed84
font_01_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 10676 bytes
SHA-256: a84d25213f528211de04924065cbcd30dc0be8030134287e9273bca2110e83c5

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