Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f4121d963dfcc5…

MALICIOUS

PDF

72.5 KB Created: 2021-06-12 13:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 81503d4f37d11ef3de436af8e3deebae SHA-1: 4e0a28ae0b3437f253a344b30d461c047d8c771a SHA-256: 19f4121d963dfcc57334515ab5bfdae46da6b4f4fc3e76666fdd4abd83dd2460
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting it's used to redirect users to phishing or malware hosting sites. The presence of PDF-specific heuristics related to link farms and compromised uploads further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8256

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 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
  • 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://drafthe.ru/uplcv?utm_term=new+buddy+system+pokemon+go PDF link annotation
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/77df4416c84afe90bcfb6ad8286e8373/2553658876.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b417d9209---detowudugumaluwewal.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cd1d1f911d36b05a427b70ec98ce43b5/buwud.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160af6d4cdf448---niwevusibokudupafelox.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/disetemezogijomezif.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1956c9fe6d---41468594466.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/22644236616.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5198e098---81841700442.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0c6d08c6---20074416620.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/21dcnc43grf6usbbc3r5uovndg/munemevekow.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894db90f330---3665167877.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/srabu6p9tajf9tnm4q6oo0aqr9/kaporowunowosasufetoro.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/kevepujipuxujuwukudali.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3411870e---risivekugilunorosoni.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ctctcfcv7d4p8hnajsgm9abqg2/16533279913.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c1af76ecd49f4ba4a10b8d7ad12bfba3/27919879028.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfcad90753---wanixerewaronegameromeza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn 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_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 5308 bytes
SHA-256: 79fe7bbe4a6fd5be3491f6a2293aeed7c6bb292a40d89bc460554406ae362e6a

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