Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6ff581d72e11f8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 23:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1cc5f874e5ba925d0f39a49dcaea6a76 SHA-1: b8a9e521d6a9180ff721cec0f9427325963cba03 SHA-256: be6ff581d72e11f86eed6f0b16c2282df0f7685b9c4e02b6de2d27186c3b456d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The heuristic findings indicate a link farm designed to lure users with a 'PDF converter' pretext, likely leading to a malware download. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=convertidor+pdf+a+word+online+2 PDF link annotation
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f16aabc93f9d6c8f30c1309ed249761c/rikajerupe.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879c7760a1d---90047318072.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/62744229440.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/cuk1j92m91g28huk962g8eqr73/63067969976.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a9ec368472e820146bd58c4639f4f306/dimepuluxono.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/10355098665.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b3fbc769---88394037209.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c327afb20b7---narulijow.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/22917475630.pdfIn PDF document text
    • http://distributoram.com/files/file/jitizel.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613235ac81f8c---votewa.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/27985357491.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/013e33bdcb427623143cf825d8abc893/22993157426.pdfIn PDF document text
    • https://ka-base.no/images_content/file/28412179390.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/tupeguzoxalujujisetefuvid.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613161bc44d9a---tamesizuvadus.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a6434350---nejijetunoxijavef.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/15805705276.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ika68l980665tuiboqtbue2rlr/dagaxuvarun.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/kiwezamavewiwusul.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/aceedaffa23cc91de7630ba4798e8ce4/sopumisu.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/tanifojeranikopitutafuzon.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/vobunofuva.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/1tgujfsr6c35grmvdvb2h24h72/wezolalepabagajafip.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102bfdf54e9b---wilevulolesebelo.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_off0000d1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F6 18764 bytes
SHA-256: 67304d8ca917d30a0df919282bf0ceed58f72250c5d8cd05ad4a93c6f812ce21
font_01_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 10624 bytes
SHA-256: 7f5db86bfedd84aea1eb22091d2b5c4d028e5abfe758d3d2f72137e21b7eb855

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