Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de5c551b8fed121…

MALICIOUS

PDF

97.1 KB Created: 2021-07-05 05:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bcb40f687ce5ba4915ce37168c9344b5 SHA-1: 74e1c090a485204127327d72a48ebb7da450a94c SHA-256: 4de5c551b8fed121bb00d5ff0cc5d72c67f81ba1161f30b8a522f5c515172e8f
156 Risk Score

Malware Insights

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

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, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://cichanski.com/Upload/file/bapilumotuv.pdf In PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d841604f6caa700a73870a60a0d0b5e4/7606906330.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/6ac8159fbfvlnm8befm6ako6u2/bolaxurepebevipar.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/jotujasazijelogizowalalik.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210518134538463.pdfIn PDF document text
    • https://digireg.it/upload/58706464868.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2be07a8b31eb7cbf6eb298236a3970db/kokibel.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///36627065529.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ca2177525a00fdf86822b70db0914cd3/64017233515.pdfIn PDF document text
    • https://ancoraeducacion.com/images/44456209767.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f3833a1f---63462998617.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/158dbcb22ec84d4a3e3b5a3c233ac05d/60053827970.pdfIn PDF document text
    • http://jngf.cn/files/file/gosipimizas.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/rinixufoferuw.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c611067db9---72538374223.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/lofbade3fa8dn750omr81su36p/kolezonumujupuzolud.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/03pv4k0rktci93tilmaoon9n92/betabinagakunolapefuti.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b47eebf5---telanuzejadaneralesokalim.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/fulegage.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/23t9nnnb7qg5higlbkp5mfbnro/72275521125.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae11d61de8---pesekuwukevegubewuxukuman.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/pf20aegchs4f051r9p279ep5fn/bagisaruj.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/jixuzusedirosupuxolenu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/0dpacf1jve344thjctn06ujfps/rutanomibapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=spring+integration+in+action+pdf+free+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_off0001164e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164E 10788 bytes
SHA-256: 1c798672b0e09e912085018d8e7bb9594bd2502ea3e479e8a8933636b6064c49
font_01_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 19200 bytes
SHA-256: 49a1cc2c47e6b416d2683c5d59f765957edd5e16cbfaa595405315ef94f8e7d2
font_02_sfnt_off00015edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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