Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a99b79f59c1fd9…

MALICIOUS

PDF

89.6 KB Created: 2021-08-10 14:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0e7c7b56173978d464f6282bee172b3 SHA-1: 89587208fa1618e7068a3c8ba3037919c09acea2 SHA-256: 26a99b79f59c1fd9379c7d06ca123266f19e838e5c8ab8a871fa8559a84ebf68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms on compromised CMS uploads supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=verbos+irregulares+en+ingles+en+pasado+simple+y+participio PDF link annotation
    • http://ouhkpthaa.org/userfiles/68972888961.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/porilejajenurafumiwiwigu.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/piputuzixukizomiboxozoj.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae836166d54---52453754659.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/fimozopevesuzu.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/nonoxolagigijuxuki.pdfIn PDF document text
    • https://penzion-palice.cz/content/11706535833.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/fa9d23794f2fccf49a3a1f7c44cdb596/74819212791.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/weretusizajepa.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5b4f77a7d17da25b0cb7152ed524ffbe/gojutozalodizaxugi.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/sizina.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/92191560630.pdfIn PDF document text
    • https://network-italia.com/file/22965099633.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/eee65e1699c205b135fee0ded201ba88/lirisok.pdfIn PDF document text
    • http://artside.org/data/temp/file/79097295111.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/4fab9b073bd42fd72dd0bda9a240a7a5/88903525466.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/94830261596.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/116153959.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/46675713190.pdfIn PDF document text
    • http://asmolmerdiven.com/depo/sayfaresim/file/gobelewodevewoxagusum.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/31190249548.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bec84dc96665a86de38814e6dc26cb2d/vapevipizetifesudoniwa.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/gatexarijepan.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_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 11180 bytes
SHA-256: 5c67cddd46976b373dfb62d0c48ecefe70b084136c60f61d8f0fb84aa008f6ee
font_01_sfnt_off00010fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 18124 bytes
SHA-256: 9cf0913d9058a0e76fd1e033ede3acdaa4116643138612394d01c3483129f73b
font_02_sfnt_off00013e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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