Malicious PDF — malware analysis report

Static analysis result for SHA-256 8732d40429796ea9…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 15:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2dca8443e1f444e188da6af228fdde99 SHA-1: 3c9116ed052e650599fa3b815fe4edb9bf708d59 SHA-256: 8732d40429796ea99c9c027f4f2f5267eeef7e2618cb48dd106bec96ed987908
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a phishing or malware distribution campaign. No scripts were extracted, but the document structure itself is designed to lure users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=barcode+reader+app+iphone PDF link annotation
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/25307934754.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/jofaxovakijimotuk.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc56e7428e---19404279821.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/wozetamapum.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0888941001631054307.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/85429335855.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143e2d8a1e2d---31370780705.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/75436607097.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/13933879006.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/45331691790.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff196de4fd---bamobemovomotubapupelew.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/72491906012.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613006b5cb047---51735140005.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/rogonazolopotasepazijedo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130972d7f80d---87698031750.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/sufedivuzu.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/kivesuxezepebimixikogiz.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac71612d4c---19409096221.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/tusowopuxuku.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109021722452659.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/pagininuso.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_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 10352 bytes
SHA-256: c61085e9649f78c29d375430210a02fd455ade3cb1a5fc19a4cb337a1eeba5bb
font_01_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 17472 bytes
SHA-256: 423dcc633c75d6c01af3432949eb6956f8331153dd27ef08bd980991f404c35e

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