Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fe82ee0c6e1fa5…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 05:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d3a907e0cb7aa3dbec321cc4bdbaece SHA-1: ff45e0293181232436ad7136c6b2e78f4f305be1 SHA-256: b0fe82ee0c6e1fa5be08089787383291666ae678f9c905472807870b0d0a2537
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://quatanggiabao.com/images/uploads/files/81247004013.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c87e41c3187---zajopipubimowoxera.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/sosesibovuguzivuwubi.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/37736026109.pdfIn PDF document text
    • https://orangerun.re/photo/files/tagikixodiniv.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b122280027f---97958296883.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/39445299341.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/50403403635.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/557e48b5842c53ada206d9a51eb0197b/44520637617.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/4845711333.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/pemubib.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/55925979363.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/bitanifu.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/6223981170.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/12315609729.pdfIn PDF document text
    • http://cudicio.it/images/file/dexivarobozelakofivosoxo.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/47558651027.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/kilazilokin.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949b96fb70---30733766641.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/26263904464.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/34966732462.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/57403724412.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/n07e4s7t3hbt62hv5hjqse2om8/10731104559.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/tolizuvegananuvubibikik.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/6976086135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=laughed+phonetic+spellingPDF 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_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10748 bytes
SHA-256: 2c11fe31be2ed86616724b22219f1cb4ada727ed40115b0e26f2c0160dae4a4b
font_02_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 18712 bytes
SHA-256: 865d99cf2f58ed4a481ba949d614f41d5d474ec9c14a7d6ac241cc49d2ab48d5