Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80bc457e207ae03…

MALICIOUS

PDF

75.9 KB Created: 2021-09-22 11:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4acced58ccecc658211c35f02090122 SHA-1: bbfc36c194598bc7fb533e3858d28c12ecd6b25a SHA-256: b80bc457e207ae03be4e7f36e876f1cef6b50f28396d49e85fc0953d781c7e12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://abyss.sk/userfiles/file/deruluwurabiz.pdf In PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/68285879744.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/70556491921.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362e5bd2bc4---wuxejewasebebegox.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/21218696541.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/35038953840.pdfIn PDF document text
    • https://biomisszio.hu/tmp/lejoraf.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/86135455616.pdfIn PDF document text
    • http://domexpo.ru/up/file/61193741608.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109041055577948.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7c04afan245d3a7mih154vjq04/28061238752.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/mejepegojuvatabuletidekax.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161485d3194197---55596476885.pdfIn PDF document text
    • https://forumsevens.com/images/file/novejakozajifixesiganej.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/28400079784.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/dawazi.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/54784474759.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/33324362414.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5089c88350f944ce8b940679d1f54652/dexezedazebeda.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/75226949395.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/nofax.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210914142237.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/kugadosom.pdfIn PDF document text
    • http://medrea.ru/upload/files/wubodexagokolanani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=brawl+stars+latest+version+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_off0000c7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B8 16444 bytes
SHA-256: db7c5d214aa86261e163cac66be4ab139a7ba2064dcd4e9e07278996f86a8d31
font_01_sfnt_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 10544 bytes
SHA-256: b5367e77c6588eccda134846e2853f9d95ec5b761261de1ba0c8fa61d0f56a2d