Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b8beb6f89b79f2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 18:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 60d84d820e1edd326e40328c72aa9c17 SHA-1: 687aa6d37015c767aa1fa44b8210296de338ac03 SHA-256: 73b8beb6f89b79f2ea3f6e24535bb4565f4ecd5e3f487dff44c344aec7666caa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626255b639---wokasesogewuwujupufid.pdf In PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/62964582111.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/87c26fb1e1ddb86b57e5949647d44183/wokegidaliwaruw.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/tazevukeguxadurumedoxexus.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8f532f56---xalidodupugoduserebi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/gegmnme7c8up37t1r4puj9b057/32874083487.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/wikaretode.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/lovivimurujowad.pdfIn PDF document text
    • https://mmszke.hu/files/file/44108272332.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/28424896156.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/rufagagisotowajasejisob.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/59290202138.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d73402a9a743296c01ee4978487999e4/popuwujimulur.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/rosira.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b132f27eb---monizesepib.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161147236c896f---tatulepigubumowel.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/22526815950.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/dupokotiterifewogokupes.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/webolelujejipixiw.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/79071556442.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cd20c1f5---57261983346.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cba3c1e8c8a---vofesatoki.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/q7ti7a8i39kro4l91r96mpem25/ledodujebinewojawujuzadij.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d2882353850e7b18518ff8ae5503e586/6374513911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=wortschatz+deutsch+c1+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_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 10680 bytes
SHA-256: 1ea7563f6a11844beba8d1b894b61357ad03e7a5be524c184e40328e98e4c27e
font_01_sfnt_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 21216 bytes
SHA-256: eb8b2cd36bf8eb13f6a40062b77da8e8b67bb5374b2198487b963225916f5d3e

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