Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ad4a1c8f8e70eb…

MALICIOUS

PDF

99.3 KB Created: 2021-07-04 16:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5abaa5bddb5bb9ff04ffbc51b46130f SHA-1: eb10f30ceebfb13651faa3ec5fa0eca873879c20 SHA-256: 85ad4a1c8f8e70eb1e9557df2ce34993b16bebced3f83133ed53e69bf2c4045a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests the document's primary purpose is to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 6

  • 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.
  • 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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846cd0320df---83630889879.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078aee7f1803---31273556011.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ludelefedub.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b552b151a0---fiwataribipomebepeve.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7a155d711---ratubupazutovigafo.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43853347801.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9956b9da72---vodokupoxulito.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lnoqq25btu0c7f2ei4ifqp77fd/70688171239.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/c3595d2b3274b4635b3158f296150a2a/gomixojuvuxeno.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/e7aa0c5ea6cc35a206eced779322c2f0/24860203259.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/69238776582.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/nadalabujavazefadutaje.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc0337292d---rirexusomovunovexab.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/duzekuwizikaminagovo.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/nogifipamifixibiraxapemus.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/8355049650.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/736ed4f09fa079244bba3cd0b973bd69/37596746488.pdfIn PDF document text
    • https://csodamalom.hu/files/files/66156806282.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/tiziretosigu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f124d00d7---20233974867.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/parokawebuvoxomojoz.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/52135740134.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/49004601249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+dragon+brawlers+mod+apk+android+1PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 16308 bytes
SHA-256: b3b8094e4caace41ed814f97b400e5b8d699f1310494bcd9d93db0cfa5b6a597
font_01_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 1720 bytes
SHA-256: 37b06908812226deffd4a46e1c220c8d1eea1b5ce5510ec4693d6f1ef0e17b45
font_03_sfnt_off00013374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13374 19304 bytes
SHA-256: f32403a873740d2a7d4f379fe4ad52ce0c2a325fe8e4f87c250a363996ac83e7
font_04_sfnt_off0001658a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658A 11008 bytes
SHA-256: 439d3fe4699f637765377917c263bd37003c5b283d02d4f3be84316d31fb09f7

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