Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ac342bfb4d2226…

MALICIOUS

PDF

81.1 KB Created: 2021-08-20 13:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0147031520c7572728c3f5402e36ec9 SHA-1: f398e1eb91615ac6ba4ae69cdda4efac8c452e77 SHA-256: 17ac342bfb4d222654a1b38a35c82434d8609d2c9e91d39c538fa5e94736767e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://huntic.ru/uplcv?utm_term=mii+maker+online+scratch PDF link annotation
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/22548192680.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tulisadisi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc1635df7---wifozido.pdfIn PDF document text
    • https://soechi.com/userfiles/file/26551131186.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/52680185612.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/kojepapivusifese.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/sezoduruvizawunitogozero.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/sejubebuxenabatetaxuzaxu.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021072405480573499.pdfIn PDF document text
    • http://intergeored.com/upload/File/18289159644.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/41492897400.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/xuxokepufozujevibotorad.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/3041081771.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/9c354b5303eb80c1f7924061d81f9a97/30319063219.pdfIn PDF document text
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/jabudokanasinedekuzar.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/20547984431.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/132495471231dac54689191fa20c8a6b/60329239410.pdfIn PDF document text
    • http://mybed.tw/uploads//files/202108061344206472.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/gisosenokojeki.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/welofume.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a137711fc31---19602909891.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_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 17788 bytes
SHA-256: ab65ef8523dcab199ce9238c8229f92b75579c3db912fa0a1ebe0f7ab6a71a02
font_01_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 10580 bytes
SHA-256: ba23569e3a27b806ed79d758a9cdcddcf46c53426098708f3496c220934ae750
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1