Malicious PDF — malware analysis report

Static analysis result for SHA-256 2749b3393a4c3603…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 01:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50ff9fdbcb150aaaca76c6c51acded0a SHA-1: 34291edd8063af5b9ead80a3b0de4ca29238dd3e SHA-256: 2749b3393a4c3603df21b3307fc5d93b8d6bc9e58636cbe0bc5c17d2ec71392c
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 identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users into clicking malicious links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://strahyi.ru/images/file/7439807353.pdf In PDF document text
    • http://cuakeobinhduong.com/upload/files/97261199944.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/84587901134.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/dutekemaba.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/xotamekeropuwepawafifudix.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/23482511968.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/49501818096.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/53689482001.pdfIn PDF document text
    • https://dcimx.com/files/vakegiwamunizazofeb.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/xawusokufuketokototan.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb996616df---fikifopexinem.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/cee92068c7780b7aba27369d0343ac25/1789785721.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/tugasur.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/deletitapogopis.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210913011421.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/41791926881.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/jaxiv.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/kiwasisegef.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/wivuvulixefasalawaj.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/jazodukuxexigo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3de7466bb---3851173736.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/42116471fe3d58b2916d0babde2ec434/56801751822.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/94415182265.pdfIn PDF document text
    • http://gr-chem.com/upload/files/tiwegedowunomafoxerabis.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0d4dac33ad021ce7a05ed9d765dc2b99/96967545549.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109141356106969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cheat+android+gamesPDF 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_off0000ba21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA21 10680 bytes
SHA-256: 94922dfadbd7fe4549900ff88a27fc67567c4d5192a29fe11a049bdeca6fcf3b
font_01_sfnt_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 15732 bytes
SHA-256: c92410f15a774ece7bed1dc6d63ca4cb57c922d5be6ad2e58321d90cd2db1140
font_02_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1