Malicious PDF — malware analysis report

Static analysis result for SHA-256 583cb8de010bd0e9…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 18:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81b21f89fa1c4989642890251b166265 SHA-1: 1a2dfd0a50329d9fcafd0943582afc7813f1f9cc SHA-256: 583cb8de010bd0e9b4856d935740f34ff2a58f48a0e8d05c1f281312d24b6c82
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to external sites, some of which appear to be hosted on compromised CMS uploads. The primary purpose seems to be redirecting users to potentially malicious content, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://biomedchita.ru/imeg_master/file/turovezasuxaxavufogi.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/58223e75251d5e5fcd5b90515fb2ec6c/88028236055.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0469a5cf14af45ac2807c1fc3ef8aa61/74448890060.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160995c3edb7aa---sopefijurisoniwetakiz.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/89632365424.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc17766d241---xaweguji.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/4064325519.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0099b76e2a---85786106614.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/52892854339.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/22727855519.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/fumivezijixaxa.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109020005264442.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/64087862034.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/sobawako.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/bilomugoge.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/20488218431.pdfIn PDF document text
    • https://ccskin.com/geektic/files/zawoleko.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836d14784b---94369798911.pdfIn PDF document text
    • http://fkhd.cz/data/img/14892701458.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/93601836185.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da734b46a6b---32363882053.pdfIn PDF document text
    • https://zhansq.cn/upload/file/lekitutawoza.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/75845684769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=kinds+of+adjectives+worksheets+for+grade+5PDF 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_off0000c590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 11208 bytes
SHA-256: e5f241a5c0be86d0ff76e83ae15a61fe27347889b55635978bded16c49c9fc96
font_02_sfnt_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 19720 bytes
SHA-256: 366a6a7ccfc91da5224ba22c1c05df43d5a90e300df4a440b87602184e55a28b

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