Malicious PDF — malware analysis report

Static analysis result for SHA-256 879f748bc20676ba…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 19:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a19f0f54719fd7a9aacf7e3bc97c2fdc SHA-1: c4f986d0853d836dcad513db91049b741580aee3 SHA-256: 879f748bc20676baf0c8fe4877cec9cac8e6978a64f066191b202d5b2bcc1436
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/48559542836.pdf In PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/14327943580.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135096ec50b9---82310825599.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/silatavije.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/29219305794.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/92763122807.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2109030603424748725en6a.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/24437446925.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/duralebu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7138aec0498d5c9736f3633dfed295b2/mejudokefi.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/mofojobiximiduri.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/fd4c1043412f7e02260a60dbb7bc2447/dopafidopezamagazezoremur.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210903212720.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/resoxudasiverowezepuxe.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/1981648393.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d40acd0f9---vadonebakodepanorumevagig.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210904214631.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161368205e8ccc---rapozubedonodatebovozumup.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414cd601c3---zewewavogovadilotiwuvuri.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/nodoj.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/90331438678.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/dumixisezaf.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/pedefatixazolevexiwe.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/pekogumubobus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=snake+app+apk+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_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 19236 bytes
SHA-256: cad6d9a1e1c989cbc8c909ec442f7ce22380b41a1ba7916c6ef90133bb7fb487
font_01_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 10180 bytes
SHA-256: 9d6724f1d03fb11231fef322f72a6d6cac20e2334c958418f4579b53e38298c8

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