Malicious PDF — malware analysis report

Static analysis result for SHA-256 049dbf05775fbbc8…

MALICIOUS

PDF

77.2 KB Created: 2021-09-14 12:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e97ce25dcdae4a1005bd270a41ea8388 SHA-1: 65d02c34744d6d4ff32f9de236d7629dfe0878fd SHA-256: 049dbf05775fbbc8442914f3f2bd9e02fd76c3c477d6bf4084cc57bd6c7fd9e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://synerhu.ru/uplcv?utm_term=in+her+skin+watch+online+free PDF link annotation
    • http://zit-tech.com/userfiles/files/96980854734.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/37631266663.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/45513017872.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133985fbe2e4---66918378757.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/xisuwesax.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/jodazomo.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/30661089351.pdfIn PDF document text
    • http://bresky.cz/res/file/poburigasumab.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/73128128161.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/wokedunifirekedot.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090523493373499.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/remonejitepusobodikugu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd91fe7cb2---90534146499.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/67413788608.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/zefabadum.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/zafiwexi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0a96852731f2da56658561c0aa77644b/titepusozef.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/27020362481.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/8267681757.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/dipalukosixux.pdfIn PDF document text
    • https://melz-feu.ru/upload/dikisenibejisojixovukuj.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/94880510219.pdfIn PDF document text
    • http://minipit.com/data/files/mazularas.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_off0000ca62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 10560 bytes
SHA-256: 797a0447b777500594c02b98af60c691556219d77b925411a74804d8183d320e
font_02_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 17092 bytes
SHA-256: 50af27d2c659860923ab1fc141f521e957eeff8a17763272dde5adee7820101b