Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff7aa4a0cdc2a50…

MALICIOUS

PDF

93.3 KB Created: 2021-06-27 10:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5970d48f99fb0957db281998cefc1996 SHA-1: bb965246d002f09251bec14710e4c487e6518153 SHA-256: bff7aa4a0cdc2a502181025d17e935d218bfecda0c7e82f5c1d01b98a063b9f3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=how+to+reheat+bbq
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/14004b0c8ad576e8d13efa757cf146d8/38844825290.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e31f53b71ea1106520c07b9d9be41786/2024519661.pdf
    • http://donateagift.eu/userfiles/file/vubibajawuwi.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45a43923b4---lifafegomuwo.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b3de4e1d2---65492381005.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096f66892817---43446324191.pdf
    • http://paradisoseminatrici.it/userfiles/files/7561174189.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed1687527---40812428467.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9b9bf11bf---67977811904.pdf
    • http://galettedesrois.hu/userfiles/file/bozasukogijuziwarikifulum.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a026b7ca81f---muwunupixoz.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fee213afb6---38213937101.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087101580ec0---tasagadibewalodabavagamo.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/xumudazelamozusijeleladi.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/u9th1hb9cq3qah5i2klca0rgsi/41725725121.pdf
    • http://jatyn.cn/upfiles/202105/file/1620309299.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cd905c6fb---tarokadoz.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e98db79f8---63078981163.pdf
    • https://gastriklandsbf.se/UserFiles/files/gobezadavesufonokaxevivij.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ab0a0719---lakexotogogolidolirid.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/s25qh74b4a13q4pm5supqlssc1/75945746133.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098970b9fc23---11824619423.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fadbc157b---53327606019.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af1.bin
3be42a14aacaf96cf762f9d469a8a33c1933b8bf6485b244a72e987628b44dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 10160 bytes
font_01_sfnt_off000121c9.bin
0967f2f292dedbf7d7cb45dd9e77defb5dd48f120851b022116f88b3eb64d4f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 17724 bytes
font_02_sfnt_off0001500f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1500F 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.