Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e593566548ce57…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 15:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f864b41f99c44c11caed56aa6cc10a2 SHA-1: 35cc48bb2e7f6ec2408159e5422a93c5dc501a17 SHA-256: b6e593566548ce573704e4ef928b3b63260e3387b6aa2f0a1335b936797a7a00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=download+game+townsmen+mod PDF link annotation
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/mipopolijejefadux.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/76539152309.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/26645085542.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/kebakitidesebemonuni.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/laxonawafawosekutozoko.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/59239528468.pdfIn PDF document text
    • http://mallncart.com/userfiles/files/60168238902.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/62902385909.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/bexuzobiwimanej.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/dimafupexe.pdfIn PDF document text
    • https://cowik.pl/upload/kabirifibewogirafutib.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/lawegib.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/pitejinifeju.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/rejufatevumugonemufo.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/mekipewilotuna.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/norusobalol.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae43cdd866---56830751290.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/35232863788.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401a682b6fe---39468715485.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/14120254076.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/vonawosokuki.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/7fabcd42d391887e05207b917dfc57f9/xumagemiko.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/98cc4bb9060ba753619bf5d93c5176a7/3356808630.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/pedonozomap.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/21267791334.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/66674323999.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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 17928 bytes
SHA-256: 0030ee5d25643a3aefed91ff635f1e52f95aee39bcb861c30f21a55ddda1aea7
font_02_sfnt_off00012841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 10488 bytes
SHA-256: 7eec4ccea8c0850d57724db8f92833b619fe8bfd10e71039f3cee86106cc8e64

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