Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cf771b06ece899…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 04:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cfb02c7d3a4946e162ef358e0acbe79b SHA-1: b8e6ada8c4a520d26f469764ee3c9c11499f1923 SHA-256: b7cf771b06ece8998539b0fd6806cba86fd553bf5e5bbd12fbfc6663aeb34a83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detection confirms its malicious nature. The primary goal appears to be directing users to malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=ang+tanging+alay+pdf PDF link annotation
    • https://shiphangnhanh.net/uploads/image/files/lorer.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4384c1f8e291b90c213ce3cd31ba7f96/49848488415.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/74778894406.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/49930796239.pdfIn PDF document text
    • http://keramann.ru/uploads/files/mujaxezopijajup.pdfIn PDF document text
    • https://medtek.vn/storage/file/93619183275.pdfIn PDF document text
    • https://tisuputih.com/contents//files/6120408652.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d57bd142f---gapiwokegenaja.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/14289643090.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae587cf69---zodikewakezajavodaziw.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb809490e25---72191663383.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d8475d5ae16c00a63df3474177d36a82/loxivemakimaxekatetu.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/gefajogujizaxog.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-6/20210506110234291519.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/liriwuvek.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/zakakixewotimofid.pdfIn PDF document text
    • http://mav-auto.ru/images/file/17915522293.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/o4tj8tvmditt4rjnp78lpr3d55/82841571572.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/8a7c08ff8852c9fc637990f7a5eb30cf/7464698601.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/ridegaxenudidugiwa.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/18147046927.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4c35023de---lawokulojedejewurux.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/99c5ac288baec2bf74d16cd01b746946/daxaxomigonovip.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_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 10248 bytes
SHA-256: d82031be3008d0695e04091e8a48143c962b67bcb85f661d04239b274bf9a3b5
font_01_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 17584 bytes
SHA-256: ef77439b87bd4f5efed5475137984096115f4519401e4226270babf475518e18
font_02_sfnt_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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