Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5067eb2a685dcb4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 12:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 298e269cd8103b9097fa7ffbbe12abd9 SHA-1: 067efa87320ce572766e63980a848dfc4fbb426a SHA-256: f5067eb2a685dcb4191793fb0d75021d593fb9b1da661e40ddd4603bed41faec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://oniceh.ru/uplcv?utm_term=android+wetter+widget+geht+nicht PDF link annotation
    • https://dentalrud.com/userfiles/file/79930110592.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/sijugufelugediruluw.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ce3b5e0c83e4d7e41af3bd9eaa3358fa/vinufemefime.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613d854952688---89669529582.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/susaxomikezekopuropepobi.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/razijidokijamu.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/93628785650.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/beridiwamebabonojag.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/towud.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/toxelisixoduxor.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/nedisuzexopabogale.pdfIn PDF document text
    • https://olterus.com/contents/files/3102288720.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/75312095942.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/58493800180.pdfIn PDF document text
    • http://gapp.fr/medias/files/lesexi.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/miviwuzulupazaruzama.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/woziv.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/80165775907.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/nenelivabogijuxusixud.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/buwoxuvoguwudenefo.pdfIn PDF document text
    • http://apsons.eu/files/file/21067682872.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/064ded89f35b8fa3cc4f80e6f3418263/dojatomewexefa.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b043c5e01d77389298f93213de721c38/dalagademizajowil.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/tuputurap.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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 10340 bytes
SHA-256: a51bb2beb963935ebf8abfd31a2ad8f867ac7638bf860933878aa5c52b047186
font_01_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 18404 bytes
SHA-256: 707688843d44af281e959b84ba13b820a9de9ea4c326d9ca022e16711c46adf7

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