Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec432e836f3da167…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 01:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 191441739a5acbcd9796134163718479 SHA-1: 304ada4b77b1874b3d785e0da19e86c51d160110 SHA-256: ec432e836f3da1677513b2f9987b42604e483881a879774549548d9033f0a574
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hazeloyun.com/calisma2/files/uploads/xiwerar.pdf In PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/zakapimijuribadoso.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/25068047130.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/babebiwuwatarinarakogixop.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/87747761573.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/navoveluvi.pdfIn PDF document text
    • http://ingore.cn/upload/files/79241802281.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/ribirumoxoketete.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/18589891288.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613051bedff60---xulufeve.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109120518155217.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/bosuwuju.pdfIn PDF document text
    • http://anm-av.de/uploads/files/fufufopaze.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/64419500039.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/84636060836.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c53629ac2---31175501932.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109110103442387.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/51959603790.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/pafulabimakutekapav.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/vikalodev.pdfIn PDF document text
    • https://mihalex.by/files/files/27565420898.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ln2lr2tu5u9s9mqllbefvkpg52/lukarijaruwasizazamom.pdfIn PDF document text
    • https://luminex.pl/upload/file/zodekutimir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=insta+pic+likerPDF 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_off0000d2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 10292 bytes
SHA-256: 8ddbe5fa5798fefd806d88a7247f453f255e47a5d049007ca2bb7fc028e194ab
font_02_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 16944 bytes
SHA-256: dda6c818fb80fc580808de863a5009d6b0333b3c319cae856ec144c305dd4883

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