Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe17a564231b7e7…

MALICIOUS

PDF

90.9 KB Created: 2021-07-05 18:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15effac86630b79eb32cda4789162ab9 SHA-1: 3e4bf142e7e0c565bb73ba3c967765b412b8c0df SHA-256: abe17a564231b7e7ea4dc0cf1eca37a732dc5c00bd2aa36b3e926c7b3b5fb3d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external URIs. Heuristics indicate a link farm hosted on compromised WordPress sites, with many distinct hosts and links. The embedded JavaScript and link farm structure suggest the PDF is designed to redirect users to malicious or phishing content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://callmarkinvestments.com/callmark/files/nukogiferaraposodibet.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/105763a28597eea29fca08f9f85ab791/lenedudurumi.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3tb60cmbcroa8j0trq3r6s6jrd/torusof.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6og7p0jfhd0a16feopr8ot9lb5/lenegozoguxudimaler.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084463428d62---xelasa.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f5b26e3d5---42494160674.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7adae1dc6---wozujokudu.pdf
    • http://malabarisproducoes.com/arquivos/files/87250791096.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/89904632757.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c24d09363---vusivevejadanaxetala.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/250dbc31f9f9c157156e88ae440631ac/lefaw.pdf
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/sofarepodegelijin.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/7117c47116c82fe9d19b1407f430d3f9/61629048739.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/q2np2sa1t0kl6an5gb2naa8mpd/vaxanuxezovero.pdf
    • https://chatsystem.site/js/ckfinder/userfiles/files/66755026737.pdf
    • https://hagepoorter.be/files/files/tatigalixe.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54307d5bc---74268826804.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/8a1a869918d18e4ac3a68c36005f3a00/95578094609.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0f5ede3ef448793b9e8446744406d4ff/pavoxabifefek.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbce5e075f---27482096444.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af5c3eb479d---53883173904.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/217728b94cb45b08f50cf517a6af8d3c/94247188372.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1dfb60dc6---64498580851.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099dab0701cf---bigenelabulobarubenapot.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f951179940---silifaveliga.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+shakespeare+quotes+funny
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 16792 bytes
font_01_sfnt_off0001172f.bin
704904c323b75dad2717d7cdab1ef6dd32d4824d8839083c620b450c38192dd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 17632 bytes
font_02_sfnt_off00014553.bin
76cbf55b40a865201c15ca9d5f4206a353e393040a21a545d360c61ebf80542c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14553 10820 bytes