Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63e5de91507e80b…

MALICIOUS

PDF

82.1 KB Created: 2021-06-26 23:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d40f73520bb2e3a8569a913b57a0f49 SHA-1: 8d2454f03387d1ba16381c4bf03c1e5eaaba27a6 SHA-256: b63e5de91507e80bc4a7d90334120ec32d9981fa0b88857f35e2b46d558a1c9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=is+baked+potato+high+in+potassium
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f9774a11f06895b54de9e0827e301c34/sakevofesirudamesitupo.pdf
    • http://manavpublicschool.org/manav/userfiles/file/bewerugoxelo.pdf
    • http://anandamsanyal.com/userfiles/file/gipaletulobiwekuwef.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1f58efc6c4e5752b3afd26d70d49e13b/nanomakig.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/tlbndgkb4qv8hjekoiq39olk5h/gozajoderixagidudig.pdf
    • http://assushop.com/userfiles/assushop.com/file/dapewamoxasonur.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086d14922b0d---jujow.pdf
    • http://lab4050.com/upload/editor/file/kerexamubukibabelemele.pdf
    • http://ausafe.net/images/art/files/39678797724.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48802228084.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b2f881a93c14e5a584265045c449316e/busakoxifonemorejiz.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c7fc308e---69045046269.pdf
    • http://csc020.com/userfiles/file/20210612004650_xno6bi.pdf
    • http://short-story.ru/upload/file/lowamipuranewewelemik.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf981fc79---7005063969.pdf
    • http://aep-tc.com/cache/fck_files/file/dagesotofidemurarozejin.pdf
    • http://arniestribu.com/campannas/file/bokivogudowegorediwimuke.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d3a2c64e---fedujesunonuxe.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/31457c84fe46fbac7751e1aa2c0540ab/kixuxi.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/84257689af83a42aeaa9352d76fc49dc/31944520783.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2aae74bc6---22933143638.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c07f1ca7ec5---32492871007.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b1bd9a1ed7d77f1d5a2d8fb127e24aa9/bekivodewupukituxupuse.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/031f834fa6fdb9afd188732828d60eb4/jowinuzefikikigat.pdf
    • 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_off0000e040.bin
df7bb2e062cd7f5e4ddda53fc1237711de5118cc095a9aba7fd984ab96099c11
pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 16112 bytes
font_01_sfnt_off000109ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 16792 bytes
font_02_sfnt_off00012203.bin
20c99917b2e7fc53e25f71e4a29f6f87ea8e41f72707757ef19c44de569a692e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 10976 bytes