Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f4443a7abe7c9f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-26 09:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b727113dfed74bcacb41c89603e47746 SHA-1: 51e36b25d356a172f678d4fcc4aac8be6fec9d30 SHA-256: a2f4443a7abe7c9f72a8fbcb0261e8dd2030748b54016a27834abd2dce5ed704
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://myblindz.com/fck_user_files/file/14609350694.pdf In PDF document text
    • https://autonoleggioassereto.com/file/67879236806.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/zupilinir.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/dovijozemaxivekinaba.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/xinowemiwu.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/37804392236.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109011033257373.pdfIn PDF document text
    • http://www.pilartangguh.com/file/latoluladumal.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/5705778959.pdfIn PDF document text
    • http://yztools.com/images/upload/File/woxifasiminobedazujeporag.pdfIn PDF document text
    • http://abwessex.com/uploads/files/vagotasejovopimomudez.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/86776669425.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa189e40c2---pajigukakinazutixapekivu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131282f5862c---80599686939.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/givusukumawesigezaxud.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a335d149---90694158621.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/15506270738.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/46740514729.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210905140720.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/55057020840.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/namozedelofikabudival.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/55554442574.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-11/20210911195758187807.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/xilefepivip.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/mabobekojamig.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/44680550761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=basketball+strength+training+program+pdfPDF 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_off0000b8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D3 17408 bytes
SHA-256: b27baa86cbb2fb5b67da875255aae26aed9ad42fea654a819eac06e3aa528c52
font_01_sfnt_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 11232 bytes
SHA-256: c927e835a98adfc86a5025cf95a2714a409cc38290607feb52e8612ded1bb23b
font_02_sfnt_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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