Malicious PDF — malware analysis report

Static analysis result for SHA-256 0199bc96e35b2769…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 08:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e19559449da14b71780762fd4d31fcaa SHA-1: 8982f76569847e870755287895f15de3d1607407 SHA-256: 0199bc96e35b2769a3ccedbdb7b49aa61f4373ce8c26ec04710f1abab90a63cb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites. These links likely serve as a lure to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.hydro-tg.pro/upload/file/xeloninaxiluwakikiza.pdf In PDF document text
    • https://clubslotalmatriche.com/calcas/file/21901141832.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613625fac9dfc---rinuwavutakifibojudilago.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/juxonefesi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa74f98f4a---46235619244.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090507480173499.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109051047363063.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/zinikufisamufukot.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c9ebfb2098acd71d18ba9ac5386578a0/49838015071.pdfIn PDF document text
    • http://coffee33.ru/archive/file/wawulakekuxem.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/gebaliw.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/19747436958.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0457dbe3---19223284094.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/23117715600.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f48ae888497d4aab04cd98e925ff4a09/powixuvamevepovil.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rovisutes.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109080223464828.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/48659281786.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/62668280075.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/14137096215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=skull+bone+namesPDF 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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 17240 bytes
SHA-256: c8ae3d3c0ef6d88edb5219848ccc8ec5f82a88b60f8c1ab26445efd2b93b475e
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 10384 bytes
SHA-256: 7a8888123e8e0e5f8eed0190199ec4d533eea672d55eea7fd6142f1a433d8592