Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ec059206b13935…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 23:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef7731b29d52e42a111943c7e4dc92dd SHA-1: 39ae337ba58d0f4919984bb9027866ce2d2d2721 SHA-256: 95ec059206b13935bfa57d699bfad543c02018483b886fcf39822c9ab247d2b2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dichvuhappyhouse.com/upload/files/77330553831.pdf In PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/892573f72c2e7a285c794dbfeddb11df/pageritojavofuj.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/78819776577.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/pedalu.pdfIn PDF document text
    • https://bem-sa.com/img/file/rovajozuvifuguni.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/94891337294.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109102018168820.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/45874762317.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/57090396335.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/wupigefa.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/15151543907.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16133d8d9dc6d3---52029984833.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/71236324728.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/98026691829.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/56977189539.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/kitasutazawujeku.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/46721174670.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135226281fcc---samexulevomevebisi.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/magaduzelelarujowaruzaxu.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/99264601433.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/92524603817.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/67792778152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=last+5+masters+winnersPDF 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_off0000d30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30F 10280 bytes
SHA-256: 536eb599e5ae0317e31e283da509c4b5e4a106deab86710ea8f33e1de941bd2b
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 17624 bytes
SHA-256: 43427b9a47a9b17f1f21d75e652c7946b51a2e4ee483abb701a7c5cc928132f9
font_02_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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