Malicious PDF — malware analysis report

Static analysis result for SHA-256 621f53fee8d8feba…

MALICIOUS

PDF

87.3 KB Created: 2021-09-09 12:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09683866fc8d50e7cf8226ad4e978c82 SHA-1: 96c105b521acfd54d25df180dfea95ef543d7e50 SHA-256: 621f53fee8d8feba4a823eb84e259936f77ff692fd5df0c5ae49a4b48356c241
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan PDF. It contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting, designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent of redirecting users through a network of dubious sites.

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 http://bud-drog.pl/userfiles/file/pejesex.pdf In PDF document text
    • https://ccichn.vn/data/upload/file/nusodewepemerexokil.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/47319306207.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f595e6c42---34503393709.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6258ce0b---rijad.pdfIn PDF document text
    • https://ismart99.net/upload/files/77233393003.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/29022589227.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/43370191332.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/38161364524.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/fewowovelutofilufoxivu.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/88882881133.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/pevit.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/dalarajuruzekaka.pdfIn PDF document text
    • http://thaide.org/userfiles/file/83908175532.pdfIn PDF document text
    • http://accronline.com/userfiles/file/68722483165.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/46280453962.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/96047346917.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/31778626600.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/mabatesigi.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/39043914483.pdfIn PDF document text
    • http://simoncaulkin.com/images/88689041046.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/39971660971.pdfIn PDF document text
    • http://18554080.com/userfiles/file/17459888127.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/80jgtrsmaj98l0m0qr8fthk338/wopasataxisakatola.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/65711010774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kamera+iphone+11+vs+samsung+s20PDF 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_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 17532 bytes
SHA-256: 9e187ecf2d9ef197e9843eb263a59dc96590d1c63578fcdbcc32897a5e211258
font_01_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FC 11004 bytes
SHA-256: 7f591e68724c5edd8189756b378a1f137cd863544cd054c88f75bee39d85240e

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