Malicious PDF — malware analysis report

Static analysis result for SHA-256 3761592eaed1858a…

MALICIOUS

PDF

89.9 KB Created: 2021-07-01 00:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dcaa5ca6dd48d19f4f88a9ab6b28387 SHA-1: f0cb8677ddcd4555098f67940facea572eebff86 SHA-256: 3761592eaed1858a20b8e4279d1a4d95e94aa9603b6142cbd9d1b1ba3778d006
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS platforms. These links likely serve as lures to phishing sites or downloaders for further malicious payloads. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e14d931cf---saxuzetumo.pdf
    • https://abouelhoulgroup.com/userfiles/files/mevowovuvegexijumuzig.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/89541544a3683ffdedca0c190a52267a/72203778709.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608762b5d05f1---ripufegujutisub.pdf
    • http://limobebe.com/userfiles/files/15525086334.pdf
    • http://imailbox.nl/images/uploadedimages/file/bidunuki.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a9afc7d01---wologomagisor.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/66d6426cf2ffe96adff2c3ee7c7d42cf/48685037771.pdf
    • http://arebiatours.com/uploads/files/jakefetavom.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a551fbac7ad---tetirifigumu.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee6d30a830---83751282795.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/44c9d6ca89edd242ab845d14a60b5299/xeruru.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/sejubatafipag.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd7bcd12e---xuvuxubumatege.pdf
    • http://veivel.com/userfiles/file/butanoz.pdf
    • http://booklandbooks.com/userfiles/file/juruzi.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/zaxexux.pdf
    • https://curryleafharleysvillepa.com/hang/userfiles/files/virumaxabinerixamovoxel.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609191fc8026e---norofawuwusonudi.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0d929aedb---26734139721.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/zuragijex.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/76083879653.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079366dd7716---44251587353.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/meboxatonezunej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=anime+girl+tongue+out
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e792.bin
e8898968e3cee6b5d61bcaa635dd6a7fd48a2a8859adfd6f30cf360b03e513c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 17384 bytes
font_01_sfnt_off000114bb.bin
281a8e0f5d6ff93c8b68c010f229fb6ad7bb76303726e8bceb98a17be6b52fdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 16320 bytes
font_02_sfnt_off00012ac7.bin
a7bae12ad2d71e990ec28c45aefda7506eaff77ce4129b629bf76d716a5adc14
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 10200 bytes
font_03_sfnt_off0001419b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1419B 16792 bytes