Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2b117926be710c…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 00:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d3ebd44b0137f1fb8888b465d714d83 SHA-1: 13a15868a241fd97b01925ba5812889aa43ff0ba SHA-256: 7c2b117926be710c24f968d3781d353b8ef19d46a7fa08508b3b92f95a75fe17
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=order+of+mesomeric+effect PDF link annotation
    • http://files.ibiza-ferien.de/file/vegilojunakodosixekanes.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1e8a8d57c---fujikan.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/42417988151.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/da2d9cdf11b64a62df243faef9358301/romijonavabaxid.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/33679880334.pdfIn PDF document text
    • https://amgaa.org/temp//files/94954347797.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b533b83d566fa57df1121f1d9d037b5d/8981242963.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/widonevusamojuvobajeli.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091e344c23ee---54891001525.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/govemisoni.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/jogigudo.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/nutivefizirip.pdfIn PDF document text
    • https://andhimazhai.com/images/files/begubinijadilebali.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ac8bfahv1244ag66iq6r6qu884/99430278578.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/wululejekaliwilabazep.pdfIn PDF document text
    • http://chipgene.com/image/files/20210726_174854.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/64623622315.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/88528586450.pdfIn PDF document text
    • https://derfo.info/resimler/files/xunatosu.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/sutaderalofamobulune.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/xosigurijikel.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072800e3c216---91266641393.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/lerenivizuzuw.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/67915267329.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_off0000c86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86B 17012 bytes
SHA-256: 442762bc4cfeb489f727ae8c2889c7ff5adda5e4ea64fe3decd9b1731c94d1da
font_01_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 10348 bytes
SHA-256: 8b8c3fcfcf70257bf2b54939ae753ad4d7f7ea52643dd77ec0392969bc694839

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