Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aff741afbd40cc8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 13:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a6fe2afd212e8224b07c7b17138a1fc SHA-1: d46288f1bd4fb3ce2d4537ab1af00422274b2972 SHA-256: 7aff741afbd40cc875de9cfcd2641a513952516961f3c92d2115bf71f3d0db8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://pixomot.ru/uplcv?utm_term=install+wiiflow+on+wii PDF link annotation
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/ximetowodamijoxewose.pdfIn PDF document text
    • http://egitara.com/upfiles/files/98695447768.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/xolofexaberaxozawuwujexo.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d673b6bc44bddc642d1eb8cf5844e292/50919151727.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/13080564108.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9201588a---47545120267.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/20240723553.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/51431408393.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/kagixaserajexakagebinakaw.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/67171819630.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/36099203033.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/81827797179.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/bofejubokizafakememobujas.pdfIn PDF document text
    • https://znalac.com/userfiles/file/walipasefen.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/10489837864.pdfIn PDF document text
    • http://giga.sk/storage/file/17808916677.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/8373759433.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/5931109209.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/79441818116.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346823bcf15---74457060512.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/47358422300.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/32237401362.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/xixawubujupegumasip.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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 20260 bytes
SHA-256: a500c10d66355ccfab6b751736b5a42666e041285df76550d2ff3a506435bb7c
font_01_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 10012 bytes
SHA-256: bbd3c3d3cbc549344308f9bd449db78bd30ffe265c939e245a2e8cdfdf26785b