Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec9e3974776dd25…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 04:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99e7a5d26a75e3bc5296c417ab5626d9 SHA-1: c5f08cf51c926be9ab0f944e71a332fd60bab3a9 SHA-256: 2ec9e3974776dd250fb13da4a177f511e620c85d4fe90c37eb91d7c14d1747e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. The presence of a link farm on compromised CMS upload storage is a key indicator of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://stfurnimart.com/file_media/file_image/file/selinamuxozoge.pdf In PDF document text
    • https://dailyiat.com/html_upload/file/vapovefatafitawetivenevif.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/judomaxazamivanekizuvi.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/40136673129.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/vazosesukuja.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/30344387793.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/49916226699.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d962f20282---levusamameko.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f12fa5e5a6---29979456750.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/7970efa169d24f6703a32221f51fd14f/97446443573.pdfIn PDF document text
    • http://bebcardkw.com/ckeditor-ckfinder-integration/uploads/files/ponasexup.pdfIn PDF document text
    • http://compsult.net/userfiles/file/ramitawo.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/febiv.pdfIn PDF document text
    • http://askort.pl/Upload/file/bejumakefisu.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/kezowezaligo.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210905_812D761D8B743457.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vcdirijg5q1eqbgsrs2kgtl852/95435838409.pdfIn PDF document text
    • http://ternovykh.ru/content/file/71712297550.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/zedexujunepakuromaneraji.pdfIn PDF document text
    • https://hgb.se/filer/file/marafonodepapo.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/dutetuwadiwenukegime.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/72121598318.pdfIn PDF document text
    • http://flirdining.com/uploads/files/gifikebipironi.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/vigonewizumonawapif.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/mojexotigugewuruz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=anna+tsing+the+mushroom+at+the+end+of+the+world+pdfPDF 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_off0000b3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 15216 bytes
SHA-256: 84c5b8f04f0d56a56a3b645f43678f268bd1616244ee1cb18942d6a65eeaf6c0
font_02_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 11112 bytes
SHA-256: e28a922e79cd9c8fe5e7d2191b430798eb4eb1109ca4f406c83de0055af61586