Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f3916d03dfb43e…

MALICIOUS

PDF

144.3 KB Created: 2021-06-27 11:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cea3417b9e476be64db4a5d7a015fe6c SHA-1: ff2253f9792ed3ef75732a4ae108448f2b3bc1b4 SHA-256: d1f3916d03dfb43eb8e74285412c7fe29c8f56aa55ca5a04b831217777593a37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://huntic.ru/uplcv?utm_term=vomiting+differential+diagnosis
    • https://festival.bg/fckeditorfiles/file/jiladaferizuwegewitapi.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16205864066074.pdf
    • http://homenet-spb.ru/userfiles/file/ragojamezewevusirupito.pdf
    • http://uk-finansist.ru/userfiles/file/popaju.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608133faf05b2---xikosa.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/egtsto1k21bmmcc3bldr9n4ef5/33088140735.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958e8351817---sibajatajedikenet.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/66f5635db0491b33c759238c81360964/ximavemutofegezoropo.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/174cd5fef007b86a3618ae6fc8de8aef/zupedumutu.pdf
    • http://chickendaylacrescenta.com/uploads/files/dikatanosiwikoxinitamu.pdf
    • http://ibtaker.ps/userfiles/file/dobijobopuzizizab.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160899f0b539b8---nabudolebidexezoturoworo.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab166d09625---sovifoditarebozowenu.pdf
    • https://audit-advisers.com/userfiles/file/59948366470.pdf
    • http://begemot-rus.com/uploadfiles/file/2021050308115373499.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/lte22mt5lgllgg8f8nlnjq4gu5/80452824604.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/nmoaf3ha6fvt7nfqjlqjtkr2ej/sudobotapuvavidupefiku.pdf
    • http://martom24.pl/martom/userfiles/file/28743212975.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ffd35f9c---gakesolumirajetu.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rmn6m0ql7gmlp9g2b4klu3t5v7/vovidakogowowemuzaporu.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608213314b6aa---91178472779.pdf
    • https://arredamentigiacobbe.it/file/dipavesovapusobogebu.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/92653dc23fcce5b4ea938a9975cbaf7f/bimazud.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/b494872f212a7ad77cf652310f680740/rumonijimejuw.pdf
    • https://houstoncoinshow.org/FCKeditor/file/24551816206.pdf
    • https://shopinhome.com/ci/userfiles/files/80830102600.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/khpbaov5m5718gpebnhfpm3i3u/51715079451.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_off0001d1b7.bin
18b2b2b5694e5dd163dccb658499b9e18cbf7e855a7d2ae7f10cf6903952a834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1B7 19068 bytes
font_01_sfnt_off000202f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x202F3 16792 bytes
font_02_sfnt_off00021b0a.bin
d27600025b4b3cc5b7ce098db71a4323d2a8ac05571e2ee3890df79312096212		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21B0A 10668 bytes

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