Malicious PDF — malware analysis report

Static analysis result for SHA-256 23599e3f621e6a0c…

MALICIOUS

PDF

91.0 KB Created: 2021-09-05 00:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b060c657e7eefa4c0fc25720199e1b67 SHA-1: 879e7dd8a964a77ff08539525e7727283eb8dd93 SHA-256: 23599e3f621e6a0c6fbf71709d2edb817683085a462f631a15e55bd8dc9c7983
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised WordPress installations. The presence of a 'download button' heuristic and the ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vitrine-prof.com/files/sidubofawopef.pdf In PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dc2e0a23---42860912921.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900032a7956---zejodefewekejejof.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/natume.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/bobalovedulav.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/tujosanip.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/gexetipeledozexojoguwewi.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/jinekeref.pdfIn PDF document text
    • https://maviet.vn/upload/files/geduxibese.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/29051295164.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/90214e7348c617610af8b789bf72fb74/kisevesode.pdfIn PDF document text
    • https://arerp.kr/data/file///3539466624.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/80b75123c8dd179dfba85074b0ca4751/wuborage.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/doremovidetisijufibokexo.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210718170821_cxibzw.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/kivuwimiliv.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/77307819754.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107b4426f5c3---72638425202.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/ritubekolizakowuwiguruze.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/eeb4329a8e6a57a49aab842ea0cd963e/60704322882.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/68669355563.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/vitukuni.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/72612e1bbed24d691cbf285a4e99e464/nagovenisixidurebawuvasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=yajurveda+sandhyavandanam+telugu+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 23216 bytes
SHA-256: 446e17438c8a0f93ecb224448c47e7c72f69cee94d7a986bc0bdba533640be9a
font_01_sfnt_off000112d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D8 11128 bytes
SHA-256: 12eb95afabeada5c3bf3981bfeec131fe6553b782d23c01230cfaa12ef8e2543
font_02_sfnt_off00012c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 17048 bytes
SHA-256: a9e03950362597d7eb1f620f5e06a2b4adef42c01099c9185875974390425d98
font_03_sfnt_off0001458e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.