Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc43db339606d2b4…

MALICIOUS

PDF

126.4 KB Created: 2021-07-02 23:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 138f6f6e8a8c5ca8ab6e2bc3273505f7 SHA-1: b50b5bb8adb3418509c8852bb98fad1512bea09b SHA-256: fc43db339606d2b41cc6fc4ebcfa28951c46b3d8000f2f1d64ed685020946b66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious link distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9091

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://artpolinakuzina.ru/pict/file/regapopemotarivi.pdf In PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9t1nmqvnmls41njn8i9867iaj5/65621248056.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/712ec75b2d23cd445df698e09f99c5e1/wanolupusa.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/989df4d9b67bd7deac2bfe15b8793251/86259902495.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/jutibo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/77c49ee2b0b985728e2b063b47a7f6f0/girapopavo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ffd823b385d6e806358608eed489c830/xezovewadotafolutejuzan.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/61f9cc644bf901d24e2822b48678cd32/mudozu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e2257ad0f---86882098195.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/nigoguzuraxologapitiko.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f60fe30dd---xivinumif.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/49853862917.pdfIn PDF document text
    • http://mobiliteit.nu/files/8379636451.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9m255shn5o77o6ua5iff8gdh45/18103042345.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/c4e5a2jfoocgl7h3h1bnhnodbf/45585197268.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7780dd2d09---gojujifate.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/2b68l47d4ipb2cehkb9qmo4sh9/22295420439.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/33501463214.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/66215183255.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162456037753163200997.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/17611880358.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/ribuduzonekezidigikibe.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b015168560---mepagukerofolevoxikuwumeb.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7e9256756---farilewalamulizorepike.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/7310f7b71bde63827a3679cbfd245f96/woximesemedimeme.pdfIn PDF document text
    • http://com123.vn/uploads/file/32861373976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=realistically+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00010b87.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B87 30852 bytes
SHA-256: 2e56751b912f203772d56a230fe198b924444b2036ae7807eed40c1e6b8d7e0b
font_01_sfnt_off000145f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F9 10616 bytes
SHA-256: 051c1f697db695f33607b98777d0e0f72fdc2a07700d201909e3b3ebace82a6d
font_02_sfnt_off00015e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001761c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1761C 13072 bytes
SHA-256: 4d85268dd8ced327d4ff378d6b92326444259420dd6e9f18438f9a2fb521bfa0
font_04_sfnt_off00019ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ED7 32868 bytes
SHA-256: edac34da2d73ee05a15a382ddccabc30bfd5e4265d0fc4cba0cb5f35cfe65610

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