Malicious PDF — malware analysis report

Static analysis result for SHA-256 326642f7ae07c776…

MALICIOUS

PDF

84.6 KB Created: 2021-07-21 10:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c4d42dd09a1d3e53cadf5498fe41405a SHA-1: 1287dadb3f7996c4a5ee4a9be3359aad11d3d5fa SHA-256: 326642f7ae07c7768cff9d4abc491b17aafd0b04df3b613c33482a4fbd414129
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 CMS upload directories, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

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://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/02f1497259298dc969e2bbb48fe84c04/bemaloxaxuxesuwu.pdf In PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/93bokgian9bku1dc6oktbbjspn/13381973298.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/nolujigopolux.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/pumotofoj.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608122462a3e0---tadasilot.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098893f38bd7---44630227198.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/guwuzalakukuba.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/pevoweba.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/dadd5e95b43f243b17fccd9837eebf4a/80523807272.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/819ba3cq4f8l7go4et85ls97oo/waguxutunuxevovugu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/emvgpaojpho31usicl397gf0l6/nafedelilarajoteg.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/54472576065.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/tepitow.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/339678611d1643f57ed4642a2b2134f1/26142180845.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c63c7b5e---fijiragotukoj.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e32ed2005---9100142995.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15324a165---35268087348.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5p4mrrrergr34ifin0bon6his3/nowewofa.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9008a8844---tufutozilosenuwudozibu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/782779bd7ab34e5419064cd9f3ca3389/pigobipulixagureba.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/6484928169.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ln92h4n9oem37qjfaju7che44/30763640164.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/tasereloli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=glucagon+is+produced+byPDF 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_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 16724 bytes
SHA-256: ca1801807aab3aed33dc89c93f0d8f6d38bb376cf8514bb46122516367b10151
font_01_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 10984 bytes
SHA-256: 691e5b64650933ec770351599e0da0bc7f429022a028a661b43372c8e95beafa
font_02_sfnt_off00012d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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