Malicious PDF — malware analysis report

Static analysis result for SHA-256 e681e1be83435d70…

MALICIOUS

PDF

76.2 KB Created: 2021-08-14 14:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 650b8af5a2be6e0883934322b067f9f8 SHA-1: ff862208c4008722690ac254f53e3daa04e09b6b SHA-256: e681e1be83435d702f55629cffd7b2be7f559e454d5571fd8424289b0d30e332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1fc77f1361bc2108c23bf8ba6cfff61e/sawefawewomapo.pdf In PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a34e853ed2c91b479421f24dacc94a74/separexexuje.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/90671771437.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d7a0738d---52368376668.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb137e2e7---46415714633.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872f474c56e---netijopar.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c929e27adc---lumapavigosijurivebagot.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107101209371830.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec271d0da3---5688471953.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/97540170749.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d939296275e9f6db4eb47299955d9c13/6631151084.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/rotowarezuxe.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/ruvopudupe.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116dff8711e8---44554954033.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/nutegelexokosu.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/batamuzim.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/28378090560.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/dalezesewodedugenawilapiv.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/guwadadixe.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/fozinekoridixidizivin.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/betumawugalivozi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076384e89864---rajanekako.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/59032853779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=reported+speech+exercises+multiple+choice+with+answersPDF 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_off0000c4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CB 16896 bytes
SHA-256: d577232fe812aa8cd82f650841ac83b6bfd892be9bdd1db458127ec459c80120
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 11112 bytes
SHA-256: cf2265f847d134c9b64ccd8b5d8f9c7469bc321b60547b400d46d35b05819835

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