Malicious PDF — malware analysis report

Static analysis result for SHA-256 598b8368655bf3d6…

MALICIOUS

PDF

86.7 KB Created: 2021-08-17 15:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0ce1514bd7de795d806df5c4cbcd8de SHA-1: 4ca902e324e45122b558625dc37e3b613c3b531c SHA-256: 598b8368655bf3d638153f321d4406979965d420722970783b3c1fac36c4315d
104 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious, and contains numerous links to external resources, many hosted on compromised CMS platforms. These links likely serve as a link farm to direct users to download malicious payloads, disguised as legitimate software or updates. The presence of a download button heuristic further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/eti2f3erq90qeuvfauboaf48kj/robivaxoj.pdf In PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b091e8ed8ec---mugesa.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/fatemiwipozod.pdfIn PDF document text
    • https://lecapsuledigian.it/file/ditutavawutugideriwofodo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4374f1676e---53209871959.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/57406881490.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f28d2169---10552701796.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/47386715935.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/43875408801.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/libhb879f4auth11ag8k5igrna/24092381377.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84ae8f905---mupomisajifozotejen.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef4349b537---detovefedewumu.pdfIn PDF document text
    • http://kotolantopeni.cz/file/lajopodo.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/32559184879.pdfIn PDF document text
    • https://superpart.com/files/bepijulikakezitigulaposi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d7eeb513---toxuwetuxitonadax.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/vafajiwadusipijeve.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/jijeridunogu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb275a85c---97000180628.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/fetokopumokufoz.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/11503002343.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/jomat.pdfIn PDF document text
    • https://immobilgold.com/file/rivopasopaduxurepaloz.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822d28b5224---88821778495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=blackmart+apk+latest+version+free+downloadPDF link annotation
    • 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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 11080 bytes
SHA-256: 4eaef7b779517f638d051f555b32c2e4759c90d07c199c0d4d1e3cd1a79f39ad
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0B 17520 bytes
SHA-256: 5443479967c9a8a3a3f6ec140f009638bdc011102567dc66720ff933ff110c71

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