Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e90e2366601a60…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 20:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f4189a9e8dfb09f5fd84ed8b63bb42fd SHA-1: 7a337da500a8af7dea5b18ec812d75aef31c9b3e SHA-256: b3e90e2366601a608eb6e8fc47a540368f7895bd2e136ec1787980b572c5eca0
176 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised or disposable hosting domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://klientskazona.radeton.sk/ckfinder/userfiles/files/jogufodafebi.pdf In PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/97471046108.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/majuxuzawimepup.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/dasepiwuleturufe.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/10008040073.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16146d4ca385e0---86178372547.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/venavusokaj.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b8ae20318---91439117057.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/wizukijogofatavurozeregu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149bad4ed252---limal.pdfIn PDF document text
    • http://pneusmarene.it/images/file/18401456106.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/69000310582.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/xivulijabaxojenosajava.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/23246765098.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/62928052684.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/vopisawaket.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7f423f4ce---sorofidar.pdfIn PDF document text
    • https://refoca.cenacat.org/yiicms/ckfinder/userfiles/files/25356370165.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/21328113284.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/391793518.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/kuleguxilofipovuju.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/bubivuxefokulozupizumewoj.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/pezomavifevagetig.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/pekefuwagune.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd498435f---72281054657.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/27101159108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=25+trillion+in+numbersPDF 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_off0000b702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB702 10504 bytes
SHA-256: c769b31df3fa471f9af057f9ea61ac32698c3626d689d5a2381f6986940cae38
font_01_sfnt_off0000ceed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEED 15948 bytes
SHA-256: 9803ca971a62814dcc678803d84e433be1863a1d2660c6d9563d829deced32e0
font_02_sfnt_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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