Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6998d2c55edca9…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 06:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67b5f8889b87191ce821bfa12bd2f0f6 SHA-1: a36db2eb1140f3277a968bdfa3453369b7fc07b1 SHA-256: 0a6998d2c55edca90385f5436c2174a08570f788af0e1f351498d4acb5d307eb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/439d8f3618b7d86009e343d4553cc05c/ributavijubamiv.pdf In PDF document text
    • http://allamericannursing.com/userfiles/file/51820607228.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/75698965575.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c498653ba2d---xafojoluxu.pdfIn PDF document text
    • http://rnralpha.cz/res/file/75783837127.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/24561184894.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/guzorazi.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1627367911.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/99456815769.pdfIn PDF document text
    • http://labsshop.com/d/files/xefijuvikajumi.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210726_F4C15F8F100C5629.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/zisapigidazuxubovize.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/fb0ff8766881f138d03292d76b848014/49500108041.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/6e9598b990910b66b572189de8258b92/99419597302.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf770e725---sawela.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/lizite.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///49952176246.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/34534709448.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/nozepatomezik.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210802024557.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/gepetugib.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/katedefajumelajuxegumor.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16077d984cd4e0---kotakapikizefizajedurixup.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3fc01fd786ca455aa19c2249b2a41bef/77776314176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=prescription+parts+and+importance+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_off0000b625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB625 10736 bytes
SHA-256: c757f8fb6859477a12ad6da9b0f46f25fc87126e1dff64bd250bd6168f864778
font_01_sfnt_off0000ced0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED0 15696 bytes
SHA-256: a14ce7d6b2ad28ee224ec4fced2d2b00601021ccf4e53429619546c33ed8e380
font_02_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1