Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f574122bbf99243…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 00:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f184d58887a3a52c3616b04e39046c0 SHA-1: e2019b1aab462e8ea2cc0c06bf927d67c7c68ce8 SHA-256: 7f574122bbf99243cd008c6c1a6bddadb9e9869134145a1d77c6b37d26304c67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to various PDF files hosted on disposable domains, likely to obscure the true malicious destination or to distribute malware. The presence of multiple PDF links and the use of UTM parameters suggest an attempt to disguise malicious downloads as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://odpadykj.cz/UserFiles/File/ludugarefuvudezusaboduv.pdf In PDF document text
    • http://gibisch.org/files/files/29119726785.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/14519503310.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/95048390084.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/pozex.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210904123505.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/gisisusivutawi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e161214eded25e41aa95575c13cab5b2/luvel.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/90793136303.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/78554810598.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/60760934131.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/1589356374.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/mhh9vkfkvoll6703lhrc198147/funewijobogixef.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/kupopurokuwuke.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8497ed3b8---xuvivinalelamif.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/kazutodixi.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/jugutetozexe.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/muvoripumisifadamek.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/sujimifizipoxorulokuwow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cloud+tv+apk+free+downloadPDF 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_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 17920 bytes
SHA-256: 1520454b11540b7497e65e8072affcfb49a87006c0040156072a76954654d087
font_01_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 10604 bytes
SHA-256: 326e88dcb18a6b89d3529c3aa54af2374e3e472d64c4c8e0ba46e5a608856e6d