Malicious PDF — malware analysis report

Static analysis result for SHA-256 c559192e9b7af0e0…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 00:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd0f1557d3a6ace99efcfa6f70eee708 SHA-1: 3b7e51bfa3ae615a9c957702bd6d37cbf02fc9e2 SHA-256: c559192e9b7af0e055692e687ef53eef33ce6e72831e85555fc2c24ffefdbeed
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially disposable or compromised domains. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://daejonggyoyc.com/userfiles/file/20210907144620.pdf In PDF document text
    • https://cicimanis.com/contents/files/rojagedageto.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/36720271721.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/16850538455.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/31341551250.pdfIn PDF document text
    • http://sushibelovo.ru/files/72872938521.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/kejot.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/40588837362.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/lolezaxa.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/11832950781.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c48a150d78f6a3d5a8fa6edfcbf5fa34/puvawirawewamir.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/tovumefugobinatupatuw.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/22207672152.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/radeg.pdfIn PDF document text
    • http://mastervin.ru/files/file/dofasijufi.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/linexizoba.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/vepuzapudonesisu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482b20e2443---repamuga.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/8751995426.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/bexab.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/21698311237.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f9f253c---48161592657.pdfIn PDF document text
    • http://askaudit.ru/price/gawawame.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/38699473309.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/simutadoranififedigos.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/zolabofamorebebulaxev.pdfIn PDF document text
    • http://balone.net/_upload/file///gorutenabobegiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=totok+mod+apkPDF 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_off0000b22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22B 15300 bytes
SHA-256: d3f7dfbd489821bdb2804a80f6ac4ffe3175d5e7525fc790375b81cd4e9e492b
font_01_sfnt_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 9968 bytes
SHA-256: 7fba94ccd3064e67649cba91a326b4d79581ad3b4905b5df60fbd6ebc2c943fe
font_02_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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