Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded90ab8cf9d8d93…

MALICIOUS

PDF

88.8 KB Created: 2021-10-07 08:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54cc9d477bf8afe6c8e4bcb95d24c9d0 SHA-1: 3722704a361fa6fb16a64782f9bae6201266834f SHA-256: ded90ab8cf9d8d9394b0db968a9e7b12dc285b7bfd094fcbc710d199ddd5be6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://medvor.ru/uplcv?utm_term=my+forehead+is+breaking+out PDF link annotation
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b64e0dbe3f---lepimopuvafo.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/20558798501.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/gososafavodajul.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/17136688268.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/pewuxoz.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/lapimajakuvabixoxo.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/talabuparexekizulalilip.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/bijekujidatedosu.pdfIn PDF document text
    • https://basisangka.com/contents/files/retulugukobatiwufejog.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/bitilefizal.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/4656589192.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/28255411163.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec2aee1561---nitujipitowabil.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/51417834023.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/zapitemulumerusazu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ed91a3c47---74844492452.pdfIn PDF document text
    • https://adikketiga.com/contents/files/30554991794.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/23855533820.pdfIn PDF document text
    • http://yilip.net/userData/board/file/16319990048.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/visoguxum.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613040f0788d6---10879953545.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee90420629---15088294720.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/fd4c1043412f7e02260a60dbb7bc2447/dopafidopezamagazezoremur.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/lamukowuzobokuzenuxozif.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/89039050387.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/8489794095.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://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_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 11024 bytes
SHA-256: 429737a8c3ee959938d0e90c40bf8926f4ee4bd4c405f655e14e8e612bc12b7c
font_01_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 19628 bytes
SHA-256: 2554a4524d7062bbfd428f0a3364e5d3a6320bb392269d302f21c00739c558da