Malicious PDF — malware analysis report

Static analysis result for SHA-256 d445ec5ac1f657b7…

MALICIOUS

PDF

117.2 KB Created: 2021-06-18 12:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 87174eb54adb53bf66e45b3465f07423 SHA-1: 93008f9cabdfae0980e650904e94e3620609402e SHA-256: d445ec5ac1f657b774ed480ac55372a5b948868ea7630e48e6e3fc37777a4464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm designed to attract users searching for movie downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to serve as a lure for further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5hkl6fhup5hp093d4260ka29r2/68666091311.pdf In PDF document text
    • http://simonide.org/userfiles/file/sizukosutonof.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/bifogebokofibixif.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/45608254972.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140606b671---resuzodirup.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e8a478c1b9fc79449d8ede196bceec88/sudatubenenonudezosadegil.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c0da4c13---17796375131.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b74f7daec08---sixitomuf.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/40745206861.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/rademit.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160847af70fd87---58058093186.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/j9q7frg4ar9rtvjap3d0vimiv1/70368823312.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0748eb4ab80e0ec3e1fb27667ea22ec0/ridibanuriradujobojar.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160984bb2e6962---54105415988.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7173101007---27742393658.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8045b88ad3---kukaboseja.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c19fd79e8df3745d85f53f52765ee6d5/89508224123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=my+autograph+kannada+movie+download+freePDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16820 5600 bytes
SHA-256: 3e66d6c24bd84d904456d0b86fd8d30b8bbf2ec8e79ada9f78da699991f7a273
font_01_sfnt_off00017b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B38 11576 bytes
SHA-256: 97aa0b4d79b48c1db98e90a974794068f0d2758e51a0ba1bbb1c9e51418f6739
font_02_sfnt_off0001a28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A28F 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
font_03_sfnt_off0001b7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7E2 3808 bytes
SHA-256: 64f27c5e46b51184f0b9406453e3f5b1ecc6c94cc0e3ba8d7aeb61470be82ed0

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