Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a13fd9e7134a65a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 01:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b9280c2c707262a1a84f4a4e1cb4ae7 SHA-1: 986acd1320608eddb26307df7b684f6bc71162ac SHA-256: 8a13fd9e7134a65aa10937f5700e42a5bdc47f7bd26a7bfd8be5fc4d4806650a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier strongly indicated maliciousness. The document contains a 'Clipboard command execution lure' heuristic, instructing the user to copy and paste content into a shell context, which is a common technique for downloading and executing secondary payloads. Several URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm used to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mistral-paints.cz/userfiles/files/kabopaxojenam.pdf In PDF document text
    • https://estoniapools.com/contents/files/gofodorevewuz.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/sonudaxegu.pdfIn PDF document text
    • http://podarox.ru/public/files/89541634704.pdfIn PDF document text
    • https://shidoremicrosys.com/media/rabegofilove.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4e9ba9e1a063568b2c0dbb64feeebddf/dexelizedilunubez.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/48391449282.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/41214684026.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210907174829.pdfIn PDF document text
    • http://houselandia.ru/files/didezadibojifurowemuxeko.pdfIn PDF document text
    • http://vce34.ru/attachments/file/tasetivavimopivivanoj.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/17981399542.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/japitubetaragamafibade.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/jesorarinosaretu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425eac0d8ec---megazifaganixeziv.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/11324152141.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/wukufuzosevopon.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/87563816559.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/37426296297.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/52757536135.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/gotowomuxuf.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/64dd73339a2680019c0079be9b1e40b3/xokunafuwasarizovuxores.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/novetibiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=share+pics+from+android+to+pcPDF 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 17732 bytes
SHA-256: 5e71abfd05a3960fab62c3394c537a5ccadbc5cf993c98031b48034cd0dd9ee9
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 10912 bytes
SHA-256: 240f5ae637edf7f6edb3b6f26d4002df1d667f300c6f535cdb01f1017a267247

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