Malicious PDF — malware analysis report

Static analysis result for SHA-256 819b9a4db4253af5…

MALICIOUS

PDF

63.8 KB Created: 2021-06-19 18:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 651bdc8dfa7ff778495b3a0a900f7f18 SHA-1: 3da8a743899f426d23c79b929ba858656e914b97 SHA-256: 819b9a4db4253af555cafbf1db38c01731968e6f9cd1fc00221497f7890658a1
212 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body contains garbled text, suggesting it's not intended for direct user consumption but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

Heuristics 5

  • 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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=spirited+away+eng+sub+online In PDF document text
    • https://infrastone.com/userfiles/files/wofufenimanilagoxo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/olubolato.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/mugume.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/zexij.pdfIn PDF document text
    • http://yuha.be/_files/file/gejomiposekog.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8b3ba6f6---62699859647.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2adb2a09a7a323fec962b5f2c73dc8e8/18178518039.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/joxomuludafufal.pdfIn PDF document text
    • https://wsbtitan.com/images/file/dezujulunoj.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/mm1qnkunvuuo4pgmi9p3krlnda/dujafagijosudeliwek.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/91740abba9bf7383b22a4f2aacbfa319/55452174805.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/84288321967.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/af9abd05dbc3cae5447109993fae155e/nadurafasarasutupimutejag.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/46279dc3d123ee208a52edfe05bfb673/juwodiniratotenovasufo.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429024649847375.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d161ed292---pugizejedusenuwatiwuru.pdfIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 7668 bytes
SHA-256: 97520b4b016850cea9d7ed99b4695e59714e562f00963dbabe80976e519c1f25

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