Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b92c32573c7805…

MALICIOUS

PDF

89.2 KB Created: 2021-07-26 05:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b87d9a9556a34c9666cf6d55f5253fb9 SHA-1: 7266b88a51b57716f9e7fbe27f1d2034211966c3 SHA-256: a4b92c32573c78050dcc78ffbb501c8aacd41f8a3c4a42bd841b443236ce9456
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 distinct hosts, some of which are compromised CMS upload directories. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chixue.com/uploadfile/file/20210726074650.pdf In PDF document text
    • https://diphong.com/uploads/witazaro.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/bivowagojomebiluf.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ae1a84a11---litut.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/54873077835.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ad95ae09855371c8a685abb602153336/37152236357.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/vuboxusavuf.pdfIn PDF document text
    • http://haphadoor.com/upload/files/4888790723.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/zeriniwu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/gifatan.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/36277463773.pdfIn PDF document text
    • http://blueyee.com/upload/file/181245127514.pdfIn PDF document text
    • https://proxus.nl/file/xugezagixokut.pdfIn PDF document text
    • http://rc-modeller.se/images/file///84580995592.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/gimizejenugivewunurodilor.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ptaat0i66kn02jaibjh3f1ot84/5933499768.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/69103171491.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/wuveliberupati.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b834714da82---57068385630.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/dogijupedatukazubixasi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e572a75e502---sofigex.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e906c33374---gorovajudajo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/55961482101.pdfIn PDF document text
    • https://retta-bg.com/userfiles/81348479311.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/gchpgeb4mjsd7ik9o1628735um/fulok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kis+kisko+pyaar+karoon+full+moviePDF 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_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 10784 bytes
SHA-256: 30e4f155eb634c412f6f1d6cc38f81c71f246441c6a532cebc4ada7ee5e3c54a
font_01_sfnt_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 17648 bytes
SHA-256: 939546361306c8f8ebb2b4590d259106abceae0f7c87a3adf998e294210290df
font_02_sfnt_off00013eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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