Malicious PDF — malware analysis report

Static analysis result for SHA-256 1165f9cb8fa6a67a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-24 04:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca1f04f1495c6c2b29640c0c33311a90 SHA-1: 25689823a85322164bb56e6f4a36c4c7884c0a2a SHA-256: 1165f9cb8fa6a67a0057fc6c7ae42cff12b7eea21fa3d89b56de1e95a3572ea5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing campaign aiming to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rbc-bezorgdiensten.nl/upload/pejok.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jjoodnmae34bara7qas2nsniav/mutamajukome.pdfIn PDF document text
    • http://pedraferro.com/files/files/18574336983.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/bafavemogaxuwazewerowok.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1d3907232---bigojuxugigikiveni.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/datojelutovikijuxafu.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/nezifawavutedexu.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/pivibubiwisonu.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/32354255190.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/novunavoperinevefab.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/15551984249.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/8310872948.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210904045058.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/keduvada.pdfIn PDF document text
    • http://kag.fr/userfiles/file/zilumevibepes.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/39427130567.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210901192903.pdfIn PDF document text
    • https://soechi.id/userfiles/file/58063759588.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/80140749812.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1ind32l06hs2ist6geik0vmig5/lifoguko.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/67723772042.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kfqi61o8nf77crrah725bkace5/vakowedadugafazugovir.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161319bc7804a1---61010034699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=spiegel+vector+analysis+pdf+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_off0000c9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EA 11136 bytes
SHA-256: 2f20b20ba28439e04bc32b169af38de95ddb934e14aabcfe1c9ef81691fed105
font_01_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 17444 bytes
SHA-256: 3531d63498f892cc18257155547465ca9a59697fcff5eb8addf366a509a2bac9
font_02_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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