Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d369bb8bdd66dc…

MALICIOUS

PDF

78.7 KB Created: 2021-09-22 17:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69d4202425ca5c1d937be2b84ef97e4d SHA-1: 51b44bbc03f5e726dd675be8bc69fda94285a509 SHA-256: 94d369bb8bdd66dc9e466d567b54cbdcac982989518dd935a0b94582f17de47e
172 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/jobofomuw.pdf
    • http://ph-easycome.com/userfiles/file/94268131631.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/joxemosufalefa.pdf
    • http://aldobini.it/userfiles/files/puxebikesumenujimutigi.pdf
    • https://vegas-shop.net/uploads/files/13491127626.pdf
    • http://akicgiyim.com/userfiles/file/ledogolikomuni.pdf
    • http://snap-drone.com/userfiles/file/numagel.pdf
    • https://fullgame.hu/uploads/files/pudusex.pdf
    • https://condominiovillage.com/userfiles/file/10843861041.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b86719f85---lowoxedinak.pdf
    • http://sitarofindiamd.com/userfiles/file/gofuduzetasikata.pdf
    • http://lorichphoto.com/pictures/file/wibipa.pdf
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/nulekanofazalabisefigowu.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161325a86179d8---fezom.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b343aed49d---43911790446.pdf
    • http://pokebarslo.com/uploads/files/gudevuganep.pdf
    • https://nbcmedia.vn/ckfinder/userfiles/files/77790680394.pdf
    • http://delifarm.com/images/file/xixaxopefikupakumatole.pdf
    • http://fantacyhandicraft.com/userfiles/file/55500455453.pdf
    • http://luxcottage.ru/stroykamen/userfiles/files/13692289215.pdf
    • https://peiitw.com/Upload/ckeditor/files/28407539838.pdf
    • http://kaizousha.com/js/upload/files/22052547228.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c5b437c82---91159209044.pdf
    • http://gnatowski.pl/attachments/file/tisufixaloxemiwaxoguri.pdf
    • https://jmclimatizacionhvac.cl/images/subidas/file/paveromu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=air+supremacy+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC6 16792 bytes
font_01_sfnt_off0000e6d8.bin
90adeaaf4e25698ab6d97c61972d1d0463e0d4a4269bb1e4461dd4d41f642192
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 18188 bytes
font_02_sfnt_off000115d6.bin
eacabdeb5c78ae425710a7ccbdfdd417b670ce4eb3ca52010ebac8d75ad5af5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 10456 bytes