Malicious PDF — malware analysis report

Static analysis result for SHA-256 c403bbe1edfd0bb0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 19:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73b4133dc6aa41e3781dbc4bcc8ac028 SHA-1: e03b99195f7a283777fc7d39618d5e2ae71626e1 SHA-256: c403bbe1edfd0bb02c3a9afff13a2e8b108e39a7c61950219c244a895e74aed0
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of external URI heuristics and the detection of a compromised CMS upload link further support the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://cructi.ru/uplcv?utm_term=kreyszig+book+pdf PDF link annotation
    • https://citronixdeflection.com/nbloom/fckuploads/file/murujawemawozaxasedabi.pdfIn PDF document text
    • http://indel.sk/userfiles/file/14426267428.pdfIn PDF document text
    • http://benjapakee.net/UserFiles/File/zajifokezorefeg.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/07i67q36p2qn8afk8pakul21i0/kirutuzinokur.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/vaxogaxidezitotujivowuku.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/madijapanikagu.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/bakixipamifiwa.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/4744451a381282a6b4faef77e92fc6d9.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613083fa5b0ad---nadefiza.pdfIn PDF document text
    • https://shunnasato.com/74870199097.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd29d52bf---93597800154.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/gatewanajemifupomo.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/boruzowoju.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/49208866968.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304dff8f79e---webajikexubob.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f004915737---25237248548.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/10680312744.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/jolaroxajesirebiduwev.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/17718972641.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1048a8e6378cd994b7aed0da19056aa8/libexoba.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/dimoribigut.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/28235649261.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc3789ee8---ketanogomugif.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_off0000bc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC55 16964 bytes
SHA-256: 105c79c8ed38d1e5214b6cc6573c15b6b9f50732135d82272d38e6ecca3d8ba9
font_01_sfnt_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 10660 bytes
SHA-256: 79bbfbe6ec558ec8103c25a88fcddf3a968664fc656f5d9ca06b73adc6ca027a

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