Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d85a87a19476f1…

MALICIOUS

PDF

134.8 KB Created: 2021-07-17 21:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5f41fca318847a711b582a7b849288d SHA-1: a0ac62ab1e861be6fac9f51aaf0254eeb4982390 SHA-256: e4d85a87a19476f1cbae1444319a8f9e8a3f07b93f6a5fd10884612f54d61841
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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://coffeetuanvang.com/Images_upload/files/mejuziwurixepapok.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160909473c1497---lulewazev.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607649fe70e46---lituzewadezukofe.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2d6ceb06---3025690819.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/tupipobimas.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/kgb0g7c076191qmq11j4rg6lhr/4205499277.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9687583702190123bae8c48e1f212e30/76493512569.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/vudufilej.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/fedal.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/pibosokep.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af90f89849---bojusomijaxoramesuvad.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/vogatitiwiribunupeki.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/36297794335.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a44h1k06ek6ocs8notnnu536d4/7734968523.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/godipizafebiba.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090f022ad70b---xojaxugipexotakiduwiro.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qpdjvru7m1h31121s9fg24irt9/mopewotosig.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/8477984847.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/nufuramodisogep.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb05e00095e---vezupimawibametoli.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/16314749914.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/fawukexedokaratufa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e05e5b80def47e08d20f2876c62afd46/tafalepubopegi.pdfIn PDF document text
    • http://aven.su/userfiles/file/95140337686.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bef966ec5---37061208866.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7af0ae9c5---kiduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=words+that+start+and+end+with+uPDF 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_off0001ae88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C69F 10476 bytes
SHA-256: b8b8c9f6c17316e67d4de2b356f3a3bf3e58ff4a54f8f8abb516b0cef8ffab45
font_02_sfnt_off0001de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE6D 18048 bytes
SHA-256: d1f940d57d0efdf3961a2d8d6fce757e3b825f0bdd6b5ea498630d6f34f2ca50