Malicious PDF — malware analysis report

Static analysis result for SHA-256 a095fb22f29c2cf7…

MALICIOUS

PDF

76.8 KB Created: 2021-09-06 22:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 336be0f55243b40c34fc3a3e2b676821 SHA-1: ac22dc473ddf085e779d18e78299799f22ef7149 SHA-256: a095fb22f29c2cf7b4eaefeda2d30709987a8372e2e76d2bb9d6294a89c5b4a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/cb43c1a6e1a86f88bcf01012e529ac66/joxobuzovozexix.pdf In PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/10457719140.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/90593593452.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cc1b038d5a9cceaa727d5cf1d6218ddc/tikokaro.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/vuzaxivolikezeniz.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/55281020569.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/84215081436.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/95528481314.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a34d6e2d79---35986143483.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32fc3aef3---59190210538.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/hk3s8u5gls8fgvpvl31cvg3r16/30029490407.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c7eeb8a1a9265057eb8277711740862f/22952924663.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/widenifigojuka.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/24404188931.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/wugoxezamuzazigilizere.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e010496c191---57483931721.pdfIn PDF document text
    • http://greenbrier101.com/userimages/lozetapazopiwuv.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/lakiwoter.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ab74c5849---savalamuvek.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/97238722759.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/69385498043.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/41f4d392638bc7d05b7c39ae85d67767/80574106544.pdfIn PDF document text
    • http://kezmosas.hu/files/file/34755656729.pdfIn PDF document text
    • https://kratky.eu/files/file/pawojonajeravon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ayushman+bharat+yojana+hospital+list+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_off0000c215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 19356 bytes
SHA-256: ede1440692faaa8aec3f040769db53f047b33bec0f114c0581709ba921e6d0ef
font_02_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 11096 bytes
SHA-256: 75641d3fea1dfc1e5c043dfb257e3b4569c8025869303e4daca5c925b6685c34

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