Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4321696fa3295ef…

MALICIOUS

PDF

82.3 KB Created: 2021-08-26 12:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a9b1fac2389d03e6456a05f051dcd15 SHA-1: 00d9aa5604b0938c88eba3c613d2c233ca6434b5 SHA-256: d4321696fa3295ef1868da4da4e02a1a1b9f57e4011bbdadbba274179eae6889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest it is used to distribute malicious content or manipulate search engine results. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nomylo.ru/uplcv?utm_term=arrow+which+way+does+air+filter+go+in+furnace PDF link annotation
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/13377168966.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/78735639120.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/zetigavozure.pdfIn PDF document text
    • http://hodori247.com/uploads/files/7571207002.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/94634948816.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/wiparulefaxawufi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/16c86f35e6089d3b83f85ec22504217c/1888023264.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55819bb65---wigokidop.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2e30bbe3f2d3eea644be4cdd9f507ede/mokowatelomawodujiwopo.pdfIn PDF document text
    • https://digireg.sk/upload/larorazatikokavupefuva.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca91e21dcb---63554478973.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/budazegonokutirigetanope.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f053bc9ce57e34ee89651fbc4e0c48cb/vegob.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/73ba382d46d5ebc28acc60981c36d309/44329128574.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/medov.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1707bcd02a---9154286833.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/8dlpftl3h073shs08fl2bmq3f2/58360087537.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1d98d6ad---ledaxowitimujepotosiw.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/napfm5mo9g4mvcvos2s7coav0o/fakid.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5deb6d2bde---dolunutudepujezuwiforexa.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/b155cfa5a32a2c745430cb68e8af2886/46791768793.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4ab21bfbf---xexofawigonexaxet.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/ribumeneguko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 11036 bytes
SHA-256: 47e94e85d2f533023c1059380b23a61898e8b098635baf633b59134b4e4da422
font_02_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 16692 bytes
SHA-256: b592013383ff8eec8e434fc4068898ec398b295a8fecdb1945354165824ed049

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