Malicious PDF — malware analysis report

Static analysis result for SHA-256 8446df85f9f6dfd3…

MALICIOUS

PDF

77.9 KB Created: 2021-09-14 02:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 835432abfa788f85435a584f7d679fc8 SHA-1: 32834bebf7d3c784d5ffe707ceca4d0c8afcddbe SHA-256: 8446df85f9f6dfd36dc685b37e3b85c438004dd0b7d234bc9d6d64031b076767
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and link farm detections indicates an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://studioferrato.it/userfiles/files/kazuvek.pdf In PDF document text
    • https://performanshost.com/calisma2/files/uploads/8399013353.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/dakupu.pdfIn PDF document text
    • http://usateatop.com/_upload/files/xakowegadasatasudezetil.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/roxefipe.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/47684209314.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/vejogevulugebebaxidilugof.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/wifigupikaxetukizelorenuv.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4a846dce---53705179575.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/lodugefezegofed.pdfIn PDF document text
    • http://etkenkalip.com/files/zosazez.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e287f24e---wewosuzedewareguxut.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/lubon.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/lomopev.pdfIn PDF document text
    • https://chptravel.ir/data/file/35497278938.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613043554178e---zifadikariwakemibiwivut.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/tuzogagejerebobidufebelir.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xipijarobolononutexeg.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/manubixinitudeg.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/nadipopa.pdfIn PDF document text
    • http://carszana.com/image/upload/File/vedawawepoxosu.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/40068961721.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/82992444856.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/fobenifexades.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=unseen+messenger+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_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 17920 bytes
SHA-256: ea38d61f1fcd21990e1a48092ab01a96284a18cb4acaa5018e1660efc10aff95
font_02_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 10732 bytes
SHA-256: 419e04412cf8edb6a2b1cb5506917f94b7a91ec0a9edca77afdb0e664819efbd

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