Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb28afd5564253f…

MALICIOUS

PDF

81.8 KB Created: 2021-07-02 16:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d6780bd12a65b87be7c1cf46d6c431c1 SHA-1: bb66a362d2982f7984379c94715d0e3faf50776a SHA-256: 7cb28afd5564253fde8d1fcf56191b2eeb00e729b8aed0b8152ebd6189d4387f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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 http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16073c725aece0---dalogewavudibuvanole.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5be22659c8587e9f99eb57da0f615529/dopedutikakob.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/moditokegaden.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/94873487117.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ae8a5aef94ef263fc158e7ad26182109/ragita.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcbb2cb2c4---dowozizigexasevada.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071b68a8ffb9---kozavepaposo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/96129994963.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/subekunukogopena.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e35df06a5cd5914c7844c2216bcbcf11/bunugaxitoz.pdfIn PDF document text
    • http://slsnn.ru/content/file/34497339929.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/hssl432okhtcqev8v5or5h0867/golanisirupugojidi.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/78169344932.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc017073cf---689105418.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/6923310b8a6a4c62fc76e71c4a4ddf37/86116001839.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/kubexibakojuvab.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/zazoxugosebawavaguk.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d86edadf842abc6f02e7cced8cc5d1a0/67407541968.pdfIn PDF document text
    • https://naoshima-habitant.com/52651102829.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e34fe6bac684e72dce1fd263b65a1260/zesewafobebibegulat.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c742f671fd---75029556089.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/13108630495.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160962bbfc113f---safamipiwelopem.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82109304393.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/noxuwononiginuzek.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca3090964---10405958683.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/93121345683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sushi+lower+east+sidePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 10500 bytes
SHA-256: 0b3da073bd6f2928ebf19e1f95753bd4a31906775a6c6f30f0a6b740c093e4ed
font_01_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 16676 bytes
SHA-256: 7fe592965bcd1aaee70bca8712671236552626465c9ae950f6e7035204854590
font_02_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 1860 bytes
SHA-256: 30be5a91942780fa81786624b3adcbe859ffcc3c6e3c9561f6efa503287fdc18
font_03_sfnt_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1