Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad38753142a5ec7…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 13:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6620de0730436f60afc0dd1bccafcefb SHA-1: 0d51fbeddb57c37caf1b9767e38b89a63fc2ccf8 SHA-256: 7ad38753142a5ec7cd23c3e48a58af6963efb30f725f32b62a3d88b13c567072
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 link farms hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials. The embedded JavaScript is likely responsible for initiating the download or redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=pokemon+leaf+green+download+android PDF link annotation
    • http://abwingsmd.com/uploads/files/89193486148.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/21140478268.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/dfa3ccb3903d17d8e2d40a77da5efd35/94431671160.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/83066751599.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/14945127798.pdfIn PDF document text
    • http://hidramaco.com/files/files/26858213925.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/nilamekozodukaregafuk.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bffcb9398---90465216285.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210908_FFC3D11527E43580.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/wowamumebuletataponu.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/tufetokipasi.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/vaxebijasuxina.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/tagugesabuzafazazizipu.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/71495440215.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/davunuwej.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/50283566762.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/41143324937.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c3b8887feb42d19fe57cf477207917be/junafamekupojirawunevet.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614074de1072a---vudulisosegufulesiri.pdfIn PDF document text
    • http://www.og2c.com/images/file/kudinazikobakiw.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210901_105015.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/34520394614.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/97409282751.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613042536960f---55418293053.pdfIn PDF document text
    • 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_off0000b83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 16460 bytes
SHA-256: 0da32fa296202d653f391c5d8f0151d0bf762812c45e2c3e755c16df389be3f7
font_02_sfnt_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 10612 bytes
SHA-256: 2d8055494d7df61e9e84497c5160b0496ac9c7d4171ee5296611df8f0a1db32a

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