Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf3ac7f9fb18406…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 04:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7b4e33f627efed8d0f567646c38e464 SHA-1: 86a0948d22e76d55199b06bc914aa8a6451e5eb6 SHA-256: ccf3ac7f9fb18406a3bee21ff3bd9cd2f48ab0458fb7a77f11f807455c1b69d3
96 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 compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly identified this PDF as malicious, and the presence of embedded URLs suggests an attempt to lead users to phishing or malware download sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=emotional+wheel+chart+pdf PDF link annotation
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/5mvea9k3m9hkap6b3232bnvn21/virabekiwav.pdfIn PDF document text
    • http://rotang.net/userfiles/file/gotuxekaxewebafare.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/26274db0f7643e88da47a0b94832df95/widibodagesarak.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/88552671289.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af211ab7b0---nebomukunizejevolimej.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/710b6646c6c4cb5c23f0b828721aaf67/43217519366.pdfIn PDF document text
    • http://wamer.org/userfiles/file/kosazowirizafor.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/lufubukuvibopokekugado.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/48qbqc1rbvmuholdc5nafcopol/zavadaxe.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a9302ba8---weziwamojitawabonijitobus.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa75b1759a---61531818717.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a56581ed1f6---5523076946.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6aced6210---53364711335.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/mavefovonilomit.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/mizoretemodimu.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/96739817798.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/64418449274.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f108dfa0dc82919cea7f2e03d9cd9002/mufol.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/kuleruzekal.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/bajugewemofu.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/62369713000.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16093a71dd8cd9---garejuzinitumizipuxawav.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f719444356---89529692552.pdfIn PDF document text
    • http://bensonhigh67.com/clients/55910/File/28644678320.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/97087274369.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/i0l02j5ikusfrp1k71pt0fsuf5/52144147269.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_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 10788 bytes
SHA-256: 3e7988f974c60695cd4ace9ac3d0181f77a7feaf09484b3cdd25256c14222df0
font_02_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 17144 bytes
SHA-256: 832963494957646960bbae5a8e0e4a6e1a9c0b8b3f601f3f877f07258f0ed352

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