Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bf8b446f4ca6f9…

MALICIOUS

PDF

80.3 KB Created: 2021-07-20 19:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5ee4f773b94322c65fd8349315c3d50c SHA-1: d36571a720cc41869efccd5da3f06d0d18d8a961 SHA-256: 63bf8b446f4ca6f9a0790e36b7268c71381c19fc19f0c18435b0efbe0ac6d4f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, 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 delivery. The file's structure and link farm nature align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://workcoop.org/fckeditor/userimages/file/20210713044304.pdf In PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1f5lprsr6cf24m7cqi7meluri8/69579645746.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/1465198391.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/vitipobekumalogeziw.pdfIn PDF document text
    • http://landpas.pl/upload/file/67530033610.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/musewotewinanasas.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160cfde4ce2a69---pepefodusonale.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/57662100475.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67qv7j27jqao7lr8jb8bkt4nd0/liwalubetubafe.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998247d6d1e---14738185180.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c306fb2f310---napirodatikezuwimiw.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3ff303c2---gimifujiwiwuxelo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53c287c9d---35989312785.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/jejuboderatu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5e056f14---zawatoxip.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7ece9396e78aaf937edcb41536732b58/50762148499.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/sebox.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/k1a9snf59fbc7a3bbqf88v8u31/nazanebodifijaz.pdfIn PDF document text
    • https://geniodelweb.com/file/gepofonarenuvavabat.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53ff6906b---norogixiposusokip.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afeb546afe---fuxemipavamakuf.pdfIn PDF document text
    • http://test888.org/uploads/productsfiles/20210625232432_9bf94.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/deliwifopekafisipej.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-5/20210705064423941786.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608819470a125---9617256800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+grand+pequot+towerPDF 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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 17020 bytes
SHA-256: 59733d8560276b521c1b6ec34e68dd9e9751e6b006d2281fc6dcf0e2df60ad57
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 10660 bytes
SHA-256: 7b759329d81e076909422c309c67a7f7795eea7924b84b12a8caf28a38074cf0

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