Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7e1709c1256319…

MALICIOUS

PDF

143.0 KB Created: 2021-07-07 09:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1e377545f08eab855fb449c5c2ac6b1 SHA-1: 475900af4eba411d867e7fdcd19bb350be241d75 SHA-256: 3f7e1709c125631947fd7633722c2b9c20af901234cb3b677cbd6c2c589553cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also features a large number of external links, many hosted on compromised WordPress sites, indicating a potential phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/900732f9c98855f2b4b1a53ec16bbf34/7842036611.pdf In PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/87134502481.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1b45318eb6befabeef56ff3cdef67bc2/fufuluxovekoxi.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210614_CE270EF7588DC0C0.pdfIn PDF document text
    • http://chikatere.com/Upload/files/fuwagaraxibagosutakifu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ovvun6mnq3b0lg3i9iiakf19f1/nigawotiper.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/18219094981.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/jljihvou1obs98i6tpq5m00use/garumunozofem.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096997878308---nopepunawonaroxu.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/lijelesulerirelelabin.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071af49d922c---rexanaxasoxewakefiwijega.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c28f8e72959---femel.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/89391933405.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/da07a1d60f0360c48e94f22f70ef0b5d/nunopu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vk143ompaqa9sn9k7df9qksn33/54542780295.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/wiminazisarosivuvizididos.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/ed8f7bca8810f1f4346fe6160bb0fbef/67714320570.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ef1c2f8754e60c649c2c30d59dd6889d/vexudemudekuji.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf11f92113c---xexipezogusuv.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8693288e---94295559484.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/87342673415.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928fdb2869e---rapadefawefosubuxu.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/dusovupimelujezudasanadur.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4f751ef5887fce06a68f4804acd8efd6/niwedovef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=miscarriage+ultrasound+6+weeksPDF 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_off0001cc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC22 10984 bytes
SHA-256: 6002c185bee11b02909256a893a33a88962542ef7c05c264671de9bd3d2e651f
font_01_sfnt_off0001e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5AC 18636 bytes
SHA-256: 1192cbe6eaa965cbfed550cff169570bd0921433ed5e27805cf7e2b40e69b72a
font_02_sfnt_off00021609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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