Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c28bce9fe3c969…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 01:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 136408120df4acadb2ad95ae29b379df SHA-1: ae290d88d5fc1d43dd3185c76a192876fa5dd77c SHA-256: f7c28bce9fe3c9698b1de0d6f82229a4f21a8ee77f910c828d6869d306311c73
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac723a6d31---vizup.pdf In PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/sezexavusexadaruburodu.pdfIn PDF document text
    • http://gns3.swiz.eu/files/editor/notugagofawijitasagasum.pdfIn PDF document text
    • http://zl369.net/userfiles/file/gakajetitidekimubiv.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/772291958.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/62580592871.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/juvosuzex.pdfIn PDF document text
    • http://sdes.in/uploads/nixumuvutebu.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/56823973254.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/vamufu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139abb877903---vorurixurese.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161327edf3698f---53708066417.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/89847541510.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613147decc011---fevimun.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/nusemafotejezejale.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/89397598486.pdfIn PDF document text
    • http://glttek.com/userfiles/file/fifusidugijawal.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/niwupimawebumosujozozugu.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/58737388755.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/gobuvevosu.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/30161305874.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136cac0d5329---55515655696.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/kumilebaxumevexupinefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=harvest+moon+online+apkPDF 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_off0000b18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18A 10564 bytes
SHA-256: cc5aae2321311112c435617f3bff75daac742927047ba66cccee51b0b8090a24
font_01_sfnt_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 14620 bytes
SHA-256: 82fd59e5985eb120743f5c4f8f238fa00ff759c7358f095fa5c4e9617bedfd99

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