Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad0d22d43283e56…

MALICIOUS

PDF

77.0 KB Created: 2021-07-24 21:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f4b63c8e6e7bf736c8efc75f1632105 SHA-1: 2ac1c57d4422fa2487afc49e3eee8bd119c31ace SHA-256: cad0d22d43283e5655f7c7d09c902a0842897d2d5d1608b446d1d8eb9c3d2f28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to malicious content, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/656fa2a7fa31e35c8e4678c966c10584/16172204834.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608038463429a---84237982024.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/n2cjdmn461721kt2vho7clnsn2/mogutinisebexuxivifalobu.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/siqri7lfr0iu5i6b6lrgtktcvb/53321288670.pdf
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/madivi.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ef10a031---gatitavebofelojaro.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/68a0ac612537a7b2d0fa4609026fde2f/kifojeviluli.pdf
    • http://jtylek.pl/Upload/file/43286112379.pdf
    • https://soosekszer.hu/upload/files/kosus.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160756c0365e4b---63406023533.pdf
    • https://cplastik.cz/data/cms/file/gadalevi.pdf
    • http://conservativista.com/js/ckfinder/userfiles/files/84963583549.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12901906d---62541916927.pdf
    • http://wmc21.com/ckupload/files/vofofo.pdf
    • http://guojingmall.com/userfiles/file///somilavijokewopabotif.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/69298f1eae60d7da643096f5299b6235/galunigukomepi.pdf
    • http://bestorkate.com/uploads/ckeditor/files/70257687619.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/04dc6e84b94ce87dff87232b17c06aa9/7139432531.pdf
    • http://billedbutikken.dk/articlefiles/file/2606091257.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qgbj0pcunf0i25md0q197kef83/65887568583.pdf
    • http://pnmanagementsolutions.in/uploads/mibepepoko.pdf
    • http://laiyi-art.com/userfiles/file/31805159833.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16248754905058.pdf
    • https://narimasu-chintai.net/jcfiles/file/95376781020.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sin+senos+si+hay+paraiso+temporada+2+capitulo+36+completo
    • 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_off0000c4e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E3 16792 bytes
font_01_sfnt_off0000dcfa.bin
be2c59a9924eb4844b7a97e6f6cee52a3245511b65423ef9a449b061a85b210c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 11528 bytes
font_02_sfnt_off0000f829.bin
2db8b5a56c865e234fab19e6f19ac8afc58939b44283db8de182df2440637adc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 17196 bytes