Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34ec3337350fe85…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 01:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e60e960f4c5b4822d7cc0cda7eb3cca1 SHA-1: 216db8e2747367395a84ff8e87cec580adb890bd SHA-256: b34ec3337350fe854241faab36341bec8df01ef5a5a5ea4b3fb51938f849ba21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.gamylai.vn/uploads/files/96353113129.pdf In PDF document text
    • http://madison62alumni.com/clients/e/e8/e84cd6a5166dbe8c5f6852bff763f4b2/File/54374954642.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/fawivetunokafowadopola.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/22814894330.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e253a6c9e4a---3587240474.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb75303f8c1---bufifejimelotogifuletipa.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/85b108dbff766e6c49e538803afa5ef6/temepigedebusejunojifa.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/mupaxomok.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/55801339436.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-8-16/20210816061236649353.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c55c627ecae---zatopamelonitewa.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9942a441---fupapadilajufuboj.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/lerixifibawigiretot.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/depuror.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19066332760.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/76979469834.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1esv6hht426j74unpg1s57bod2/32424270943.pdfIn PDF document text
    • http://hasyo.net/files/file/riboka.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/20408478398.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/16183691070.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/70482836706.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c37f33f2fbe---kazowilonurexuz.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72923371957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=nec+style+manualPDF 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_off0000bc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4C 16100 bytes
SHA-256: ae79fa48dc57224cce2aa133bb8b2486d1d0d19bd579f7d90187542ea4dd5991
font_01_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 10268 bytes
SHA-256: 46e2ebb5fc8759582cc4e44c9e874e556b621916f5bc81f7e904172b21342042
font_02_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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