Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd196a5e497dc12…

MALICIOUS

PDF

88.8 KB Created: 2021-09-03 13:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08daf9315b5c4dc10686cf5f3f3d8b94 SHA-1: 8f47e904873a95be9989dcf4c08cde710cd6df9a SHA-256: 8bd196a5e497dc12dd6a921da3fd24d214f3655fd209a27bf31eaecfa3d86696
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. A critical heuristic identified a 'Clipboard command execution lure,' instructing the user to copy and paste content into a shell, which is a common technique for executing malicious payloads. The document also contains numerous links to potentially compromised websites, suggesting it may be part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/49571802429.pdf In PDF document text
    • http://omeofest.eu/userfiles/files/19557731935.pdfIn PDF document text
    • https://vestol.bg/files/file/23445431143.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/vasuxonewujarovufuxa.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/9sp0a7a9t1v3e7dgpiscmuncab/gixilibunixiguboven.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/bibewatukajozofewabop.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/volifonepof.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/10710221969.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/merexuwafetaxowiwejon.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/judeduvotapidik.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/63791714622.pdfIn PDF document text
    • http://unseretochter.ch/images/file/jasovamisuxugol.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/r1lb9akbq0jmgt616rm4p0f2qj/wulasewote.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/69196485043.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/33360006472.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/lanegobewima.pdfIn PDF document text
    • http://teplospectr.ru/images/files/99922486115.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/sirurobijiza.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021082005285729225.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/xibewozupijekuva.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6fbd09b86efef6328f426c68cde30cc5/10313046197.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c521fcb3943---gamibuzin.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a9b94ac72adcbcbc7c52f246ff373fcb/fotowijekawikini.pdfIn PDF document text
    • https://kimcert.org/E/file/gubinovijogekimareko.pdfIn PDF document text
    • http://lblussana.it/images/file/bawinobelafijidoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=starting+air+system+marine+diesel+engine+pdfPDF 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_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 10908 bytes
SHA-256: eb921d8ec8b8a06c28f1af84795484dd9fa18d875e827ad85f35cdded1874514
font_01_sfnt_off00010fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 17500 bytes
SHA-256: 3e63cd19deca86659c91d618591abc0b365264c50dc405f706fb2a617113e0e2
font_02_sfnt_off00013cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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