Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7abd49ba9e3542c…

MALICIOUS

PDF

104.6 KB Created: 2021-07-06 02:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e4bd941c9f5d360630e2b8722109151e SHA-1: c4f17c1cd8da06c229466f7937be78105f85f604 SHA-256: b7abd49ba9e3542c2f402ac778255d6a8d942aea21164d4803725e7c96ab76a5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is a link farm, likely intended to redirect users to malicious sites for phishing or malware delivery. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 https://huntic.ru/uplcv?utm_term=rigged+meaning+in+kannada PDF link annotation
    • https://midasspa.com/ckfinder/userfiles/files/rajutezik.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/sojaramajajazakus.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/7037aff459dd0550eff679ee62b737ce/suvulokekizuxev.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/9456036173.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceb3c2030b---sanorura.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1db25a48f---31471803381.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1afa65915---sazituvoniz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9e062bfe---jumodulelibeb.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/617359782.pdfIn PDF document text
    • http://klefmarken.se/upload/file/zorelakovujasize.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9ed7d118472e05a6400e555691ff8ebd/56083775140.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/davenefaz.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/gegib.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20f94ebab5---nadigig.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/579d2265079ebdcbd24c60055a47b146/sasewavapazasefolosu.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/94009307633.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09277d4ca7---viwilib.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a731f793b00---kinifupusugamubosetuseguk.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c248b55a---95841829531.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9220bfcaa---gubufuz.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/welekikofan.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bade4bc6c5---dazomamirake.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae7dcb7560---55684167882.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d42069a336f---52193427832.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/57267f0bb12056b5949f5111b9612550/futusevatasepalufiwopiw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D48 16356 bytes
SHA-256: 7137caa0d48be2bdef9ded51c9e32cf0520f5a9697382352acc3afe5a39b1539
font_02_sfnt_off000143c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C5 22240 bytes
SHA-256: 7f676479032248a56c6688c2ef9fd1846164cab70a67ff7a64719e5decc0a2a6
font_03_sfnt_off00017dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DFB 10196 bytes
SHA-256: 2961f5eddff7c12704ac98343c89497c7f6934d39bce6ebcc9879d7aac88b116