Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2a03921026c253…

MALICIOUS

PDF

90.7 KB Created: 2021-08-07 15:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b7078f29d34bddda327ce7d70200bb6 SHA-1: 4869e69d1b2f44f2bfe3f647124a208be8b7db28 SHA-256: 8d2a03921026c253c03694302660afb6c5ea27f53e7f3393117e5eecaaf9e63f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ecogestval.com/userfiles/file/95587011705.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b6cae5e2f022108a9f9c114aa55c4def/vedegewune.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/mrsbp9prcvfp3fsssqugshcgno/87759598779.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b95b21ad4---xoliwubevufelunuzutenow.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/gakifufozuxexitawukom.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/jelavevomopunamedobejamo.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/samojefubiwo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce76ac5ce4---joxujifujusemukeronuv.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1507f1845---49153031471.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/90846007176.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/69590670937.pdfIn PDF document text
    • http://orrizon.ru/images/file/fekuzorexawupipilus.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc81735349---muropusujeperuwoverovuz.pdfIn PDF document text
    • https://motiv8workout.com/up/files/talutodil.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4nc9sh5b1ctv6gohq0fho5q950/tufofizopuzewuminoluda.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l45i905oielbtil4jib15msg16/69124897604.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ff80c33e---10611685153.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/soridelojurobatoniwevid.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/33023913258.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/839847cc04fabd394ce991ecb133e61f/minipajerelazefigapavexan.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/8272809235.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a461f7a9df2ba890a6643d5926bf9d04/59947350465.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/nuvovimigevuxeza.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b34ec0b9d---naxoruzotufotowukipiwolut.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/22179381565.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b842107edf7---zuzalixafax.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/popibul.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7899cfd6b---79854172606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+an+article+in+a+newspaper+definitionPDF 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_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 10796 bytes
SHA-256: e7764dce10cd853724b06e7131801aef13291ff345cc040f70b913b7f84ef0e1
font_01_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 17220 bytes
SHA-256: 1387d6238c5bb63b1852b7d16f7bacf54e9183b3fa436f0f36a63a9c2d651ec4
font_02_sfnt_off0001450d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1450D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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