Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eea52a9eeff60b3…

MALICIOUS

PDF

92.4 KB Created: 2021-09-07 21:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e52a69e5b4899ef084f1e63bac8e01d7 SHA-1: 69f3286bda0e56781a7d44715050303ff3660937 SHA-256: 3eea52a9eeff60b3c72dc95612d3d60ebfdcb723c1c2ecce7958f660e50c5666
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm pointing to numerous disposable domains, likely intended to obscure the ultimate destination. The presence of embedded JavaScript suggests potential for further malicious actions, such as exploiting browser vulnerabilities or redirecting to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ahxxzx.com/userfiles/202106/file/19852930474.pdf In PDF document text
    • https://peilimineko.com/userfiles/file/govomuvizubobiniwutujuw.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/puvuna.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd3f8c433---monujowifujikamamowiwu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/982a47d9c00e73a141246c13a52d3198/56791483811.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/kog4hp57fj6kqmf1424sbvohbl/21052302114.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/4472582171.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611eff64becde---zovejunemibajuwawewisisuw.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89f641bdc---narukukeniwolotova.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210807101845.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/janaberevufusito.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/jebes.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088fae8630fa---mikobixasiraxugeto.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/bolaxitenolilux.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/31719270692.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80accdcaa---letiximoxidagoj.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/46251342283.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/sorumiwuvebebeviz.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/42156941285.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/33608402163.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8772e7ba4---xifarurimexunusatotuwuj.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/vimopadasiwilogegode.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/tijewoputetaxosudili.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/88554848853.pdfIn PDF document text
    • http://zerosquareonline.com/file/fexujefofup.pdfIn PDF document text
    • http://sam-global.info/files/file/69225588571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rainfall+induced+landslides+pdfPDF 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_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 10440 bytes
SHA-256: 3980a497255b9b5a82e7356f2d5d385bf788946c47d6dd39ad21ac317dd78b79
font_01_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 19124 bytes
SHA-256: 71851e806a0c038ba422a4c62786177de2f452ad54c0c0d4602a8cad5e3269cf
font_02_sfnt_off00014b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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