Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57ec69b8c4e293a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 00:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5a4454349147f3d0f107cc3199951ab SHA-1: ff7eaeb0ca2c1026b0764c40be287f975a923197 SHA-256: a57ec69b8c4e293a6c32ea55913a67f0c481a372a7737da265a65dfcf62717da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm or phishing attempt. The presence of these links indicates an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5100dc8858---37159004377.pdf In PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/50778bc2ea1b46265a8c7fd76568342d/4807063639.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/jafifase.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/42197608895.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/vivif.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/dabodenapajukeras.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/nabelesarowonifunogefu.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/sigivolosawizotapujo.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/69785967306.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/otp30fvpa3l9vi0a3baetlupi2/tojodugul.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/17604633319.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/7e787c5760989cd930c9889d68aa5e92/kijiwunase.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/36676373528.pdfIn PDF document text
    • http://patroha.hu/file/56226954661.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/j681ggbnegn5q9qo5907f4upjm/kekarakutivuxu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/9uh6v0d1k35qvrvrccpuuun628/53858735873.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/70299835213.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f13c29d7edd96725b459ad77a923180f/19927707834.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/ginunotogireso.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc604cce705---nipuzaw.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/89335266320.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/da6c3a7c59b80226def68bf15205db40/4048474493.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/93078380016.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/riditigoxokigaferuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bankers+adda+free+mock+test+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_off0000b971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB971 10788 bytes
SHA-256: 77902ce880e848a4abe4cceed2694ddb230a9fa08e4418050d4e8705e93c402c
font_01_sfnt_off0000d258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 17376 bytes
SHA-256: 2cfb528cfcf90fee97fc6908e908c4cce4d8ce687bda076f844a8bebeb3614a8

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