Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b34eddb0a862ebb…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 17:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 31ac7920e71228c69e1eea79328b3c81 SHA-1: 77b6cc0a48abc1c7d3c76db57deaf9c95fe58147 SHA-256: 7b34eddb0a862ebbb94c11134b429081906f1ab611774e5fb95905d98614d74d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=top+android+offline+strategy+games PDF link annotation
    • https://hgb.se/filer/file/5992400823.pdfIn PDF document text
    • https://electroagro.es/pub/files/najadilivawinikagejizeri.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/27664384168.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/zivatorufemoboxiruviluk.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/60019899828.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/52610205646.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/dawojobugiduxesojep.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/bobotexuwuzobiz.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/42480034636.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/101838239460.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d4f2ba027---54335398011.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/sikajinuxukoz.pdfIn PDF document text
    • http://sial.pl/galeria/file/nisadekujaluki.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/rafuxor.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/nejaluruvoronelob.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/65055288830.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/mavibuwis.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161386f8c90e56---betazolew.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e68d55cb0---robikujemesigokizunozoj.pdfIn PDF document text
    • https://renetravel.ro/images/files/91445004467.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/balifelubatovuwa.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/pufojuvidirutojek.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/panajenugujosine.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9d96250a3e534bd05bcfd38de8243a1c/6197084971.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/86746199471.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_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 16908 bytes
SHA-256: 8f29cd93fddfdeef7339e4d5ccddfdd5994d52a224b78e6e885bec9afcfa49e8
font_02_sfnt_off0001324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324A 10920 bytes
SHA-256: 13a753aacb820d453a33db077ac9805b4cc8460b4f3c40bd53d74d279736f5a9

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