Malicious PDF — malware analysis report

Static analysis result for SHA-256 0044b811dc1cc68a…

MALICIOUS

PDF

82.3 KB Created: 2021-10-09 05:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4c89a85797ad5332789ca5559b08e304 SHA-1: 6bed12c843c245ca8cf87a69893b2ac96e0d860e SHA-256: 0044b811dc1cc68ac81e21d2fba42d677fd69888c4da4a0dbb4686abf31f989e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=to+shove+meaning PDF link annotation
    • http://folientastaturen.pl/_data/file/gejurojewasurinunon.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/86508864098.pdfIn PDF document text
    • http://agaugservice.ukrkarta.ua/fckeditor/userfiles/file/83665920623.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/84004568695.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/82762474131.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/34607639807.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/10277697429.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/vuvekejapu.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/xurivexovewerezekudiku.pdfIn PDF document text
    • https://mar3ol.com/Files/files/wogusasipod.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615906a712153---wuvimakobuwujapitovanevut.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/6640620770.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/wugabafi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/87e5ba22f360b334c9fc442abcf8f013/pemojojobowa.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/14214025.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/24550030087.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/tuvuweropokutonereto.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/xamafetisa.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/fetodukenep.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e1ppl3vmqcnrv652fv6mhqrhmh/xexalexegu.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/jomudewogexugogulom.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/86676379984.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/guwebafona.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9d5f02ce---28222459734.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/pariledemupazogukes.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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 10340 bytes
SHA-256: cab654fe3d6176bb92a6f1c5a3a54a4af7da90725bc79900bffd2651789c9eaf
font_02_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 20216 bytes
SHA-256: 8addc1b4d207e5d747e949bf28ddd793b832354d2e4d29ba64fbfd7a87628f59

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