Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b1490546adec8d…

MALICIOUS

PDF

87.2 KB Created: 2021-07-30 02:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad248ad6b457e11e1d93bc57984c90a7 SHA-1: 9b7f8713d1bbb226abfe0fa4013f438303013bae SHA-256: 20b1490546adec8d07b219c2c1fd7dc15bf5dba84ee9b5875efd1970ef152746
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous links, identified as a link farm on disposable hosting, strongly suggests an attempt to direct users to malicious websites. The ML classifier also provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1f6981a70---53279531696.pdf In PDF document text
    • https://ddc-touggourt.dz/ar/files/29402623050.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f2cccdb4---begetanarogilujurasit.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/55225493405.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/nomonegurodu.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/66308852024.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fcb84856b9cef45a87ec1bcec2616886/lonuwop.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6sf48bv0lvj7g7pg75h79e4cnp/tisurijiwud.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/fifelifirosuxiv.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/vofipavovarewuzitutele.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/nutogituxodegavisobuvifiw.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f54cbaed6---74127234139.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/52612235471.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/57543637694.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c634484e---guxefunopugajag.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/grv8avuffqjfd5l6khdgurj0q7/37069932436.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/7f3fcb64b402d0384ddb1122966819b1/78813595799.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/18c3226894c441eff2949f8cc672f5c7/gewumawipozefevobefabo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b20fb0b071a---jopididogi.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/ximijutomezabixewinemix.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c53b34b78d---borogizaporu.pdfIn PDF document text
    • http://epmachine.ru/d/files/jogeriwezovilut.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/jubunuxuvedupabilo.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/8572412189.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607642b0ee913---gobejifuzefimuguzog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+determine+molecular+geometry+khan+academyPDF 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_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 11032 bytes
SHA-256: eb4f57c2bfe3b0b634495d6e8fe166328efb86687c4c0439574286184b589b93
font_01_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 17836 bytes
SHA-256: 3171dbca8acdb9e492a2a7ebe0dcc7b828f703def8afce83d476a2c9eecf8feb
font_02_sfnt_off0001364b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1