Malicious PDF — malware analysis report

Static analysis result for SHA-256 af62559982de1b90…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 23:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 15be13b2ed23cdb498e9db95ab9cdb1d SHA-1: d25017d6debe1aa446c704139e195c2cdabeb14f SHA-256: af62559982de1b90e26a70af14b65361dd6e7564727edc00398f4328fcef46b2
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier also flagged this PDF as malicious with high confidence. The presence of multiple links to potentially malicious content suggests an attempt to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae59eb6c0---23879452863.pdf In PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/67g98ngfdqcngapi439he5mqur/60014608229.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/42684660216.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/cfdeeb0f3a10473c3e92cbae40b1bd1b/11381412182.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/70451922327.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/lonosewuxezetexadelon.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/divamo.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/xuzisomugojakisosasovip.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1e0391fe---59812590257.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/96152825813.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/69108567736.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/nozolutedibalajet.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609276e6d3c08---kinitijopub.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/385b2b724078ae2d51508dfc9efdb74c/setirotenorukutobot.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742b2bcf7a---49179498086.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/68567879317.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/nuvipelebakefala.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/wezineti.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/salofori.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0325e73c9a---80129410862.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4518aabf---44146859463.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ead169383b---karexupanowarepef.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/sopivugivur.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/fovivoteritedepanav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+diary+of+a+social+butterfly+ebook+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_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 11068 bytes
SHA-256: b70d1b2712e13cd0af25f082640163cedc1f9de0cf3ef61d49348a327abd7e92
font_01_sfnt_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 17640 bytes
SHA-256: b40b247a8c9e8751794ae5f57f46d4aec33b985ded3b197159f6a2cedda8fbcc