Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dde1c127e0a4b2…

MALICIOUS

PDF

86.6 KB Created: 2021-07-01 09:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: af4ec486fe17a4db990468265bc67bd7 SHA-1: 5da2d5361b039be4f7f3cb80bfe0cf08113249b6 SHA-256: f4dde1c127e0a4b2b165971c2be8693984cb30d0c902265e4f639ee32efcb025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c307fdb121c---moziluwukuluxetomu.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094350e2de42---1340120826.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a862230911a---72595349653.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/vukoxinosuje.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd76e8b6a2---boxivaketuruzodegedum.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/merazudibot.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07c605c999---37772186957.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094894eaa2fb---59654534000.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/fodotowulifizunemadisif.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/30s4fnoavqhspv4ooh0kmcj169/miwamikibofakevomaseji.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/biriporaj.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/843cd963c5211ebfeca87538eef1dc30/53941311387.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/740994b7ad0eb7a4a736f714c5d337d9/23228308903.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/27e92085cddda0a48191384578d1ca2e/61242795283.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608c219466401---vunesusatavamo.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/205345961e3b7b281b22177d5bdfe06d/20635888921.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd91d3149c---33084895155.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafbe86f816---66441916613.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/sg07mmc2p6vjh5l36tvqaklj1g/86448242831.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/nazevaxibubax.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/50100814e5bd747e3d52a641c2e2b515/62579772603.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/dokofejidutelus.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5ab2c0cce---27917788343.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c79f7b8f7c5f0eda026acc1b48d54bb7/35616643939.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/80241763981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+recover+deleted+pdf+in+androidPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 10588 bytes
SHA-256: bec788dce16cbd89729a07c8092a75ab111be2d3ab1c1ea2e4ba81d53e87cc9a
font_01_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 17544 bytes
SHA-256: 1f2860bba119e0c4be6931a8f7568b16fab6481752f3102cbabf35a39319729e
font_02_sfnt_off000134fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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