Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fee535ee484c3e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-14 07:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7ac25871c1d4ca9ef44463ec281b4e6 SHA-1: ae1d3a0e75b3afcb0ec410c5bcafb383e1a7f4bd SHA-256: d5fee535ee484c3e73d4e3997326f59c645448e94e5b661f801b73c42c3db252
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=descargar+warcraft+3+reign+of+chaos+para+android PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2dc49b38---tewafamox.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131716277cee---remojasobipubepa.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/tewugagepuxewupove.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/bideweximijir.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ccgqpaqcehqpfaklidbahgjk5m/73213664657.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad7521353---93552487337.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/rulivenefawogov.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/pofetim.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/43965340858.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/48524239807.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/46472231769.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/zebunomepunulosokum.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/muxizamuzo.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/56703941693.pdfIn PDF document text
    • http://wwsm-us.com/files/file/beloderogexanunaguvefa.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202191746189310.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/diwoma.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109032001481830475yr9cb.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140139d646e0---11715642404.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/83571671127.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/vaxaka.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613628d7a6951---zatenerirafogag.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/32262881072.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_off0000b1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F9 11112 bytes
SHA-256: 017c6a9d1b2058c148c156892da9282a64a8d36431bac3405ef15b02d7307689
font_01_sfnt_off0000cbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC6 16948 bytes
SHA-256: 2c1f6c148f51e355f0f79b1741ba35d1afa4428d886442c09bafe5219e284cb6
font_02_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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