Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4f8de6a72e837a…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 18:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6cfb11dde0d4a67c5eb3b76a7098a933 SHA-1: 0f0200d0b6fc7559e443fd289d2ba1d73ff11820 SHA-256: fe4f8de6a72e837a9a945af060aad780abbc128f92a7eaef010521ed8f0c1069
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The presence of link farm heuristics further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=kwikset+electronic+deadbolt+manual PDF link annotation
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/wabapo.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/80411565926.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c20d3a5106---61401463442.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/rosidukuzigi.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/78217354857.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/15f359ccf31191de156b931422e09106/lusutowawemejipinazeju.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/lasigovonujaxib.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/l7mojle3umgpb8jajomfrtid37/21288855338.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109020204456986.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/1380602598.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/81813421206.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/54a68d379df1206c5c324c4718ba5310/zagenalu.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131d740e0305---56814827740.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/62963411080.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/59838923776.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/28166600615.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/mokimasijoja.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/lapapalerosanuxidoju.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/43994965815.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160981bfb71aee---85751949179.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/57615750260.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/sexiz.pdfIn PDF document text
    • https://mmszke.hu/files/file/jaligijirovanitotoku.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/xadarip.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e1128f76---xizetajodafivov.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_off0000bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 10940 bytes
SHA-256: cf1731e59ae362ffec1c00a8070e07331df6ce4b614ab4a7ba5ad47b63c8f87d
font_01_sfnt_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 16760 bytes
SHA-256: c2705843fa77511d823405f9b0aa6967ab02e79e8b645e2ab87996a859b19def
font_02_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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