Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52dc1159fdce48b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 06:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d782ec9368ba6dd20beb5a670705b323 SHA-1: 108a986d61ce5cad8df86f381f05e93354ddc661 SHA-256: a52dc1159fdce48be0eb485730be3e40dbabac1b5a1c8171de4cde059318eb1f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure points towards an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=design+system+book+pdf PDF link annotation
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/2tf46a4o7bdolpcvqf5i8ullmj/fewaburasaroz.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f3a166a71f4e643d8e1c1107bfe505e3/48365611412.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/58686353004.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6226a3e58c3074337b20cdc0f16f5ff2/nogebudosi.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/wogezadejatizilewonaka.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/98465570239.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/47637813555.pdfIn PDF document text
    • https://akconta.com/uploads/files/pivosadokunifiluripawukav.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/27459085626.pdfIn PDF document text
    • http://quinta.cl/upload/files/75618770498.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/zawadiwugibugijejepo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095d1b4e83f5---vixitaredolixakaketu.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/barubepujuwepixodex.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/70400902021.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/lunapat.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/533e3df22bd2fd04eeabdb6397c7c3cc/87772497603.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/zatetobukix.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2030956107---45871363366.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/94289825676.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb57f07b8---bedabezixixogatajoduk.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/14700724118.pdfIn PDF document text
    • 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_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 10880 bytes
SHA-256: 29454aab95d5d57570fa3e0f31b7b9c2359349c52aa594e7a7a99b909b9ec457
font_01_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 19424 bytes
SHA-256: 74c71fa6a9ac7df7cbd4fe9ae6180a312cc2fef623db9ae3293dd3f55e389312
font_02_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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