Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8344d60a30822a8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 02:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50468f70742355e9462d8493b4faa23e SHA-1: 94e91566c974278fb4a50d5e8e3b70f3444c076a SHA-256: c8344d60a30822a8506a8b3c3b33faaaaf4a9cbf84619d67f2aa91f859d3871d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, many of which are hosted on potentially compromised CMS platforms. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bhiringisamsankalimandir.org/userfiles/file/gaseriduxiv.pdf In PDF document text
    • http://harissarantis.com/userfiles/files/vuduse.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090515021197.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/dugitop.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/tamifovafigofusexa.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161317a4be878e---76271590975.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/kuzuz.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/pusevarox.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/53186391803.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/motofokabimuvilasoxubajip.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/55364351281.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/91731523416.pdfIn PDF document text
    • https://hirurgija.me/files/lexuxemivemew.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380cfeb4aa0---96532587779.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/bazodovawowigapimugo.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/34153658325.pdfIn PDF document text
    • http://devveb.net/userfiles/file/nenilesuzuluxebol.pdfIn PDF document text
    • https://mauspro.net/upload/files/54958902744.pdfIn PDF document text
    • http://szm.hu/userfiles/file/25155445851.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9494a38eac652023976ac6bd6153cabe/kabeboxirotefi.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/27079702860.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/86728392348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=flutter+setup+android+emulatorPDF 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_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 10632 bytes
SHA-256: 83e34e8ba4ae09e97617dcf5f826e99ebcc66b65fb9403b00337aec58f2811d9
font_01_sfnt_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 20012 bytes
SHA-256: d72caa742f29ce507d0dda1766476df5e2566c6ebb657d9a47ad1481dc223beb
font_02_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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