Malicious PDF — malware analysis report

Static analysis result for SHA-256 f603827c44a06472…

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 15:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6aff2ecd058eff21b0776d0191ff78b3 SHA-1: 2954d398c6787e281288e86ff04be680f2b6f527 SHA-256: f603827c44a06472f90c4c9f2b3b63c17be78fc1317bec846b1ba1360d709e46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=anywho+person+search PDF link annotation
    • http://gangwonbnb.com/FileData/ckfinder/files/20210626_523C0358A4C41817.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608379ded3aaa---42858281105.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/520aebb0ae210398ac21da25ba5bee87/1640604060.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/voruxiragexunifinugusa.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bea56bb3bc5---46960449769.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6e7dac1d4---kobavipalibadolesivu.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/befotabojixesezus.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/92hal18e9rm80r7l52j1loujf1/bineretezaguw.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf52d6c90---ketatemowadivuzusakivep.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/6275cf15b0dc83dc576ee168aa842a83/vasasusopixolikafuler.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3jd72maa8s17eec0sv22h2ci04/zuxirebulelofofepinu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/3225e8997ca80949d47ed552f0c513cd/gizamolalulumutodixu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9ivo6nbhtrgo8defa03501mruo/ditana.pdfIn PDF document text
    • http://cecev.com/stockages/files/48111451216.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b7465f0e0e5e2d819915491c88e15485/xomunojoxusalusimametevij.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/sozolomiduzezajugisixo.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab43d2fe7---zugakatijojikegonido.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843d819f61d---24087269553.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/nr063tgiqbk69ouv719c9ebsnc/rerugixedujume.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/riritelurokaruraja.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/t3i056umotg3guebpv0iblap51/78147545219.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/17555548354.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b60cdd41---pupobejebagazezanaxu.pdfIn PDF document text
    • http://esistore.be/userfiles/file/rofubumupetozet.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_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 10416 bytes
SHA-256: 9a070e2441729894822d8bd8ed876b9b2f6ea5fab493f298104d4dc097ab6628
font_01_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 17328 bytes
SHA-256: 52832fe88a51534f199515d0fd51138416de28a206bd4b1f4a529df8e01d4ed7
font_02_sfnt_off000141f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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