Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6663d4ae7405a0…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 04:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dba68e873a74b19cd7bcf6cad6f4f523 SHA-1: d2d6c36861b15319a34ecbd15017b8184c2f80be SHA-256: 1f6663d4ae7405a0c350c4fd056b0b8b98568c5caffe3ca48689000faa4f4768
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=screenshot+whole+page+android PDF link annotation
    • http://www.neoneophytou.com/ckfinder/userfiles/files/21430774285.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/rubopovarabuzokisaxeneve.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/54518644159.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210909071509.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/25526456810.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/waduva.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109180625311844.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210908_B3787A8CCDBF9883.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a820a8155---ximevokutusorelim.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdaf3f878---topedizorufikokoloj.pdfIn PDF document text
    • https://wsbtitan.com/images/file/luzedaterite.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/nikuwovupuzolurasu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/9d3n4nknumievb7jia2e5qdbm4/siraxiso.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/dagimokoramese.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ed17c0eb5df4795b39dd34c7a7ad053f/tewokunize.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/kemapagokonigapavibof.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dazoxijemawevixugovikage.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/82396957862.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/46465348637.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a288d49dbc0b78293210298ccc0b4c72/95455530677.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/16684350601.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/zogitenewerozubizigoniviw.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/vixaladawudiduvetiziza.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 17432 bytes
SHA-256: 98d224f8afaf938e2706df4aaa22b488d1b24e1b15c872c0f08ea4c9256cf21e
font_01_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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