Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a92fdf73fc86d3…

MALICIOUS

PDF

80.7 KB Created: 2021-06-22 22:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cd6dc1cd282074bbcfb5570e3b5bbfa9 SHA-1: f0e3cf3f7fd2db7e54d8a288cda560fdb2c52c6f SHA-256: 10a92fdf73fc86d3942b5d7331d488c1da7260caba8f230f729455e99a38e4a2
156 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body, though heavily obfuscated, contains references to 'Game of Thrones' and 'wkhtmltopdf', likely serving as a lure to direct users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3e2bd4fd---54493404025.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff9af7b9d1---pesapaperiwawoxupum.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/46874463464.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6f4383c1b6041d8173511a262f548d9b/savovivilobapap.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/b5422781a699ba21e4b5cbb46df4650d/fenagaka.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/209b294d35457ff69572d8671add97ea/valeviraza.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac20f2fe1a---44572386231.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/e4k37h3avji42n33doahbsbvc1/61657908321.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52916301c---28647547675.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/fevikojuxi.pdfIn PDF document text
    • https://promise-land.com/upload/file/winemutajumitofoxiw.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbb9061b7---kaneki.pdfIn PDF document text
    • http://ledson.ru/upload_picture/74162872565.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/jowasikaximobixida.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7996bfe758feef3b3823900e7a5bc9ae/90570048570.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9ec9ef353d796557cb2447b209d68b2e.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ud1ashanoo5fi3rcpuuv9uuc35/najarabod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=game+of+thrones+season+2+episode+6PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 5568 bytes
SHA-256: 957c5f89d12539502d3203938185f062251b86c1402dc99271f15ffa8857bec7
font_01_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 10792 bytes
SHA-256: eb8d9e3659a0de39cf0cf529ef39946f61f7eee31c373aad315f9402acd3986b