Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7587e77dc419ebb…

MALICIOUS

PDF

148.7 KB Created: 2021-08-19 14:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dc57f2b9cac353870ce209348db6bbe2 SHA-1: 2093a24ab66015e3c33e4eed31602057c3805d57 SHA-256: a7587e77dc419ebb814bddafdf92c213c1aeb41d54d14207b2b467cb9871c220
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for phishing or distributing further malware. The presence of embedded URLs and the nature of the link farms strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/db3bb91bc57cee50363a133ce54bedc2/60710616746.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fb4263c2c8862aa66fc6e924cd1f6adb/zoxosepariwagebutugibosi.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/gokugeluvo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3489aa92c206fe5348addb3c8deca0be/66960492259.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/fi60f61db76q0fcsbk4468se16/marowo.pdfIn PDF document text
    • http://sooclose.eu/upload/File/56402871178.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/30618213882.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f60b69deef7---joxevapor.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3103add84---3802321579.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/21645a708c4728104fb7e65022e9b161/29819223438.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210813_AD10734E87428C3A.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rh5tho21bkogp4vjeira146h67/xokomojuvuvevabe.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/19252582380.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/uncfqjoodn8oe2ot3jeid22r88/luvuwanakubezikidiripip.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/04jguaha57drrhs5bhom8ktqkf/25383739447.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bd8d77785f352a5012e97952eb525fde/vapojawozemabakuxijivow.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a44577b66dc---17064305417.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/3912908519.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/nudenedofopo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160764032e35e4---4150957356.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/sugiferilutakukulimeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+adjust+brightness+on+amazon+kindle+paperwhitePDF 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_off0001e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E214 18180 bytes
SHA-256: bb120bcd2c20e2514f850b98cb700e570fe1405abb3b2865bd1de5e84293a7b4
font_01_sfnt_off000211eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211EB 11436 bytes
SHA-256: 3a5c08bb935300508becc6bb1c71d93a3d3a6a39a2105ca063d2d0971badc353
font_02_sfnt_off00022c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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