Malicious PDF — malware analysis report

Static analysis result for SHA-256 62aa6b13e698f20b…

MALICIOUS

PDF

83.0 KB Created: 2021-10-10 10:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 73d920dafaa48d23ad355673fd327050 SHA-1: e607452de0001515459ce904879cbb6dd6581852 SHA-256: 62aa6b13e698f20b9c2314fa40a102a68f5d159c1450e8a5f3795dec8f60344a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 external websites, some hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tomekorea.com/userData/board/file/muladidejebitut.pdf In PDF document text
    • http://engelholm.boj.se/uploads/userfiles/files/88246935914.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af9a58b9d1---derizigezededa.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/fofedejapetotetusaji.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/16263345834.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/julatolezirazogo.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021108202162704.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/9832445482.pdfIn PDF document text
    • http://101balkon.ru/upload/files/fegujemetumoruvurotig.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/raxusunadixomejopik.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/zogowofon.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/molixetaregonujiw.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ndnlgj1hbk2vo1rvg7v5liogih/ropawuvezabom.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/raxofositaj.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/niliditope.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/tipujigesetuw.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/86132851635.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d861a66014da78bc94e910da7e90790e/4999662743.pdfIn PDF document text
    • https://posh.hr/files/rudilulotozijotedidi.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/tijowileworobizak.pdfIn PDF document text
    • https://nexapos.com/upload/files/xuwibogefugor.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/jovenonivagojesexukugi.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210923035309.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210906010927.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141522b472cb---busazamitufuvifufunop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=4+ingredient+peanut+butter+barsPDF 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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 10620 bytes
SHA-256: cf3fb2685d81c4fda0dfe2264e010bfd209915e6014c40104d8c99a9259d3a5a
font_02_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 19620 bytes
SHA-256: 350bc5e6c8fc62af2fec4cd1d63909ae1976e0a3e849ad2d0ac2184a01229f1e