Malicious PDF — malware analysis report

Static analysis result for SHA-256 d487a6c17f439cdf…

MALICIOUS

PDF

68.9 KB Created: 2021-06-25 19:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c124a21257f14cf7f759de5a28a1b2a2 SHA-1: 586b64e40036483ee9684fbdaba2247a42ef6a40 SHA-256: d487a6c17f439cdf3f55fc9ce914c0a85bc0f815267dcf9d26798207456a7ce8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, exploiting users who click on them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/40ldkdncmfm8hatm1jdm5tr5go/44194095128.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e5f59a7e---62827614403.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeac4e85c5---27055616459.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/26561645815.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/98573608520.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/fetitavufide.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4870e03d7589a466f3bfcdcdb6c20348/jopesinarawotoseli.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/segavabuforazoraj.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/zabijugirapuwanarafeb.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/74bdc3a0a2e68e392ccdee2afbe99ec8/xazive.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae650816af1---sufiruzajalomalefaras.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098304062eab---tovawotasewapijuruga.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/9378828080.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fce023ec5---litilivisi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ub050lbj6b5pguvmb041fhsbc2/46706209095.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7652cef84---wudizumofezekegaton.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/sofudasejifuzakevajaxid.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070221e0ca58---14299958719.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020754bfa4---83222924654.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/d76221a3a44a811bc2cc04a3d512e581/tujafifowizozenudan.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/74511e82be7a97fd7b9ee1c0fa561338/73445725444.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1aad76ebfa55f72aeedf24a1bab19cab/dazik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=compound+inequality+definitionPDF 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_off0000b09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AE 15044 bytes
SHA-256: 3ac1382b8a48070d7a34722720ed578ab554611e73b9f88835e8f90bcc7b6962
font_02_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 10780 bytes
SHA-256: 7add08ef79695b77cf963b559037561ea4875437a3664e135c5c9ea11a7f23d4

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