Malicious PDF — malware analysis report

Static analysis result for SHA-256 709fdae3d0addc39…

MALICIOUS

PDF

75.2 KB Created: 2021-09-09 20:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcb0816b5abdcd27b4861fcaf65e2987 SHA-1: e4371527035a298318f9a1a148a1befe64308c47 SHA-256: 709fdae3d0addc39d091da4ef9df4039b4c34202538e677c731aba16c090ad1f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, which likely serve as a distribution point for further malware. The primary attack pattern involves luring users to these compromised sites to download malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383226914f0.pdf In PDF document text
    • http://www.samuitns.com/image/upload/File/28477113980.pdfIn PDF document text
    • http://anindecor.pl/files/file/3484925900.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/80577873528.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a6445f90eb52ce44fe152256a070db3f/34138840289.pdfIn PDF document text
    • http://mcutech.net/files/gatozakifobanekedenadip.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16133ca08c16d7---20949745012.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/11801870181.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/814fb6cb2e3cc2dac157500bc4ed4310/bovegerelafuloxarorewa.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/51269164140.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/15357725616.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/54625517249.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f06b04535624fe164df70f2de0641754/92235306229.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/39812652897.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/gibakonetat.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ebb4b8790221019d0537e49d1c4424e/89183894791.pdfIn PDF document text
    • https://digireg.es/upload/nitunufizebovagopa.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/pamazetirakot.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/fupimaxeva.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zelalebenarumapebuwizude.pdfIn PDF document text
    • http://balalajka.nu/media/27039312704.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/zewedixibuvilotanimog.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lilijidox.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/gekidenesomigivivuxejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fs+16+mod+gamePDF 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_off0000c375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC375 17168 bytes
SHA-256: 7112443fa1bc11adb60adc7dfd19a46e9428de083a606a09093b4d5c84c8c857
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 10348 bytes
SHA-256: 92c6ea7f35b9418b03b40bbad0546dea12d7568c3d250b006ae49f8f8f588764

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