Malicious PDF — malware analysis report

Static analysis result for SHA-256 c226b8cf89e9a295…

MALICIOUS

PDF

101.4 KB Created: 2021-09-07 12:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7a4868c171b32c01a7d7924a92e5a11 SHA-1: ee54ad80c582d8a99a557934d32efa94c06877de SHA-256: c226b8cf89e9a295b4df40bae338d8d0d15ce4686d454fe323e4a9bdfff80ccc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the nature of the URLs indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3424e05ea2---safutamubufonoxopi.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3b23f4f4---vatufemoguronusake.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/9beed35fa6fdb3b9a22664a9d21cc9f5/nakinojovop.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4e02e0f7d0602117f0a49779ab8694df/xenuvilomebukedexolur.pdfIn PDF document text
    • https://clickbox.ro/images/file/vevusupuduz.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/mukejuranuz.pdfIn PDF document text
    • http://charivne.info/images/file/xoxupofosor.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/67456749934.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/78562331540.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6fda6a2a0ee5fab080fc9a9f86e14d13/33291896859.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c627b53ed---kemawovedagezuzareboxu.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/modinak.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/nupirufusoluxogokesiniro.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608496145bdf5---ropixotufe.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/fagexewaxigekiton.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/67044925066.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/mo9pqu264mmam5sqkr83sh5i85/vobekivuliwisokejejukugar.pdfIn PDF document text
    • http://groupkaishan.com/d/files/74718001265.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86159069849.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/nanijetonunorupexav.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb6c29559---buzejubukofudafexiborip.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/91385309913.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/vidomutiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=lectii+germana+incepatori+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c33c0aa8bf---42374984785.pdfIn PDF document text
    • 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_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 10708 bytes
SHA-256: 9773f688119860dd64848beecb046360aed58cfbdc33ca196bc2b5fcb518879c
font_01_sfnt_off00013b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15392 21492 bytes
SHA-256: 98192216abede2a8e08833c30a47df7e0fd3563943ab541751d7f08095b8d034