Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f31e0aa3ed74eb9…

MALICIOUS

PDF

111.0 KB Created: 2021-06-29 23:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 32ed26f0a0ab4dff86aff1b260261fb1 SHA-1: e97aee54bb3e6fd16b4a54c4d13ff49cf9c10f5b SHA-256: 5f31e0aa3ed74eb9809a64ad390b46edec39ca04d7e970c96c3d07faf0650de1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

Heuristics 6

  • 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.
  • 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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ps9cfh8o9npnpjoeo05gsmoc8l/28327505298.pdf In PDF document text
    • http://allprintusa.com/admin/images/file/towoduxuwevonixosatove.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f59d695da053fb853db1fd639d9d5ead/pafomag.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/katomopugemoxixusek.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01d3693d2a---77822218948.pdfIn PDF document text
    • https://emmaushuis.org/pages/8534638729.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/616f86edaf882f14bbe3913303aac0cf/wikezijetisikivax.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/fe33abbdf2b58c256acb5f522650a01e/37842256190.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/nuwumogofe.pdfIn PDF document text
    • https://dhesient.com/media/gefijubisonikinix.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/i7gjqrkem4dai3qpdlfaptpnt1/kubutokodurejipebejixi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c30f06cdcf5---duwemidapoxap.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084de768d58e---jijefi.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/puja8k4u0njn0j4hkn7vnapcsv/wunoridixemufupa.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/g457b82g2kai0aj5tppdupee7q/75801824322.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430bb7c0f2---dubowikukalukufofikulule.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f450fba0cbc8ed3c777750a69ec7dcd8/5800228835.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/viwumovibugifumut.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/j6hkjtq30k64qualbrnlumq6c6/26250886673.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/26af7703b3cb9fefc09c354a59930f44/24450206697.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/zomisiben.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/77187075241.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/58565958244.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/9379784946.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a016256146b---93062963060.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/v9fjv0pj3kt59q0ecpu76j28i3/62166481854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=thin+film+cellPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C68 19816 bytes
SHA-256: ba5e28e568882f03dd5d6ceffc48241e8557736e7d1081a14a938c066a8872bf
font_01_sfnt_off00017ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001980a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1980A 9916 bytes
SHA-256: 3459d081b85c619824d902ab050ffc5c2ededbb7d3df4073417a427a287c6d8b