Malicious PDF — malware analysis report

Static analysis result for SHA-256 72075272b5bd0152…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 03:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b91c5b4e285f79da66edff1277ad8044 SHA-1: bd2c0d56d3aee46fd70c3a0cc2439e4994e9f840 SHA-256: 72075272b5bd015218beed06c98cbf13475e756199c43c37269b1dc0d71bb503
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/60539213767.pdf In PDF document text
    • https://aksukartela.com/images_upload/files/94875103768.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087285fa6d64---76058279429.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b439f2d2510---6117451707.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b0b125f0---lorikeximamij.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/40947502617.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c12db0a423f2a170219e3dc596374fae/74974937022.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/viwipajugumaroraxufejija.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/26132778350.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/79251642437.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a94621aab0ce867cd2bf7e1a243d8e1d/didag.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/32132207046.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/ce0c4eae43d876111f56e814cb1dcb02/46287975231.pdfIn PDF document text
    • http://belloverde.net/emailer/file/91389081647.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aded64f40d---kakerotaserexitu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7516k855a1ijjko7om49op2uc6/zuzukivipogefimufodo.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/26014680723.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/80239540037.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/762bcebc25203b8d4360e5a560a50e30/9148511566.pdfIn PDF document text
    • http://christopherdallo.com/file/moramopudiga.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/90569749980.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/mozokeju.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/kexetipobegisaxar.pdfIn PDF document text
    • https://mimpidia.com/contents/files/difafuzaripulor.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ad68fe0d---49310257111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=synonym+antonym+worksheet+6th+gradePDF 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_off0000ccdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDF 11092 bytes
SHA-256: 43a082037be4b32d373030970d87b1558cdd6a3a5103bfa76eb1f47451d90475
font_01_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 17140 bytes
SHA-256: 6c6af398d17b747c7f5d3012780102bbf13e6dbebee2e5785922d5a496ccd007
font_02_sfnt_off000112b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1