Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50215663c6624e1…

MALICIOUS

PDF

92.6 KB Created: 2021-09-07 16:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f061c30a66e90e576bde086c6b1c364 SHA-1: 636b7467a541f1c1f9ad47396b9838da568df406 SHA-256: c50215663c6624e14e38df661131959f2469f9f1102f91203da9f54e4b92a792
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e195bbb61c6---58189834467.pdf In PDF document text
    • http://www.urbanwaterways.info/files/65544162547.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pikafavumonivu.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/855c87967802cafd2ae26564ad8b17ee/52194066411.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/luzisumenajibud.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3f329106c---16224124837.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052108175473499.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wigubimapobojidisubiduwil.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/25981599620.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/28769640307.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/18862390292.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/15487917583.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/tovakifig.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/1a5dd295372b43f7be13bae43da812ae/73239628357.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/6548906370.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/negitutepovaw.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160903d09728bc---89892894529.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/50665186908.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/56819894041.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/lonofa.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/foxofebebapudu.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/wibibepedopipuwadajofeka.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/gusurokixobefiwuz.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/900857088.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/sekegujudenavosuze.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e1d1fcc6---giweduzivafibuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=laporan+diuretik+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_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 18308 bytes
SHA-256: 02692a7021747bca810de190506190b606edc8ddeb14edf88a089bcdb617d86b
font_01_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 10424 bytes
SHA-256: 8e4f1c9ab1efcdd47595fcf965519cbe70cd577f2b2cd6b3b96c2f7d9b145602
font_02_sfnt_off00014c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1