Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdf77d5fd2b00af…

MALICIOUS

PDF

141.5 KB Created: 2021-07-09 16:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ab8ae1b3aa6aa59f7bafc3aaee907da SHA-1: 1e1da4c0844605f40984e03f71ba9e5ab6fd984e SHA-256: 6fdf77d5fd2b00af039f4576051ae8a7135d5efa9d6077f3ebde61efa7ac6fcb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://carrieres-pierre.com/userfiles/file/likipegulonokalitekunuf.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857875badb4---3272411101.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/62750380569.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/b9sapedb8bvfm9c0ovji3k4mfe/vogibuwugetivakazigujebul.pdfIn PDF document text
    • http://aweibel.com/Photo/file/zovakaz.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/gisuzoranofuxisikojene.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/89619972063.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/sogaxuzilelupidabe.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/subokoxiduzokagabanal.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/tisebulumexilunedugi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/fikazisutik.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fd46d892d040149eaa961461d2734b53/92880663818.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765caf44cb1---jevelanazizuxop.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/78738109443.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/31641219574.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/jibogufosodefumun.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076289ec0d91---90030800407.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/99f6c28faf9e39813ed0fa1dd5936731/1434343842.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e9e9aa0b---zifufuliwofev.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/85032167732.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d675073326b5acd3ec761ef957ff24dc/zuzov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=all+diode+listPDF 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_off0001c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E011 19312 bytes
SHA-256: 0790ae1f03c042231b7e96ff9a3f40e0d02132f751b418c94b861bc5ba0c8be2
font_02_sfnt_off000212f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212F8 9856 bytes
SHA-256: 29af16c686047aa3444ed08bf04723dfea5fd6205a8d4057060fe7d394832a18

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