Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bda83dae9c260e7…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 03:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64a39f2faa368ca4128a77ffcbe63fe0 SHA-1: ed75352afc615d28703f90e03ef7b45532af7882 SHA-256: 6bda83dae9c260e76fea20f0ed8cc1a48e47d1226c7e76b7f6031904009ef39b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which appear to be compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The file's structure and embedded links strongly suggest it is used as a lure to drive-by downloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=best+short+haircuts+for+men PDF link annotation
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608772d5b4ecd---dekobaregaxigon.pdfIn PDF document text
    • https://tigapilar.com/upload/files/27505568656.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021082118590673499.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/605u34gt88cqkpql3vfm853kj0/jamumemufejupupiwaju.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ed1e46bb7ac53221eb802c8b3b969a5c/kolenugujaxijuwadot.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/acefcf72830e4546588a3fffd68fedf6/33389403365.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837031cdc92---14172234321.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/19783586032.pdfIn PDF document text
    • http://feg.vn/uploads/files/41839890576.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/xawajesikuti.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/77948279320.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/lcilcopfej9pj2i2qgok9h2dkb/71860319067.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/85236247649.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da8526e226---60649416155.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b9f85db8---38952353653.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/2565625938.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/sibokili.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d32586304---97706915382.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/uf1o0e33amnvol4bpd8537poto/25351630201.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/619cu6a3mm8i1bofn119rikdo0/88747209374.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fuberowetatuwagodixuvoj.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/pokisemekamut.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1passp3lh92ijkjmocunckr81t/vabetezepot.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/91471201390.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/towuvugefolisatitujab.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_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 18280 bytes
SHA-256: 525ecd36ece31774c8de021df69575b909a36854a8be3ad764f1a357fa259c22
font_01_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C4 10708 bytes
SHA-256: 2a40b4b8445a5deb75f87ea11b7f8cf7eb9e1397ff4030444e10b60e04a071b5

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