Malicious PDF — malware analysis report

Static analysis result for SHA-256 94841374dc1e86f7…

MALICIOUS

PDF

74.1 KB Created: 2021-09-11 11:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c1f2dbeceb8b569535786ad590c29ec SHA-1: 9083219b0c9226d44737daa9f999da5d78fef30d SHA-256: 94841374dc1e86f7ce9f573a69ab23cd95d38f6d8d207022fc006c8fc6a03998
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, containing numerous URLs that redirect to various external sites. The presence of compromised CMS upload links and disposable hosting suggests a malicious intent, potentially for SEO manipulation or to distribute further malware. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://bozoklar.org/ckfinder/userfiles/files/17740338342.pdf In PDF document text
    • http://gcsiva.com/files/userfiles/file/43440025656.pdfIn PDF document text
    • http://terminsk.by/pics/files/dudinoravo.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/75931990205.pdfIn PDF document text
    • http://abwrva.com/uploads/files/futoxelunaxowuzovokub.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/2717062445.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/25339614080.pdfIn PDF document text
    • http://erimti.com/userfiles/file/jurunelulanufedagovo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4334f9d7f971770f1ccc55cec7b9a866/3760265166.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210905121600.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16139fcee34cd6---79951457893.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/matis.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/797971336.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/25568973283.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5u5u6rmuo301gssqt3j8h72vf4/96880482166.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/64977190716.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/vokuduxefotabo.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/68291416400.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f97bcbc67---94356632680.pdfIn PDF document text
    • https://tigaintan.com/contents/files/koruv.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4d543013---rebivofibenug.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/41812522558.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/36960716697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=reface+app+mod+apk+free+downloadPDF 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_off0000bde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 10648 bytes
SHA-256: 7dc65609baee9a3531903f2568c3723d9c0ed43e5288f58bbb0c0ae37017511f
font_02_sfnt_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 17380 bytes
SHA-256: d1a24f30af3cd7c96c95671af176421c020c2d9174d737d2efdf48ceb68b5023