Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fbd8027e277f41…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 10:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80403ae8efa7be136558a49b2555aff2 SHA-1: eb511d4a045d4416c16e690c6a917cf81e00efca SHA-256: e8fbd8027e277f41a0a08b2c66c5e8f9e6e2db3674f44e7d8d488550c9dc7ce9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The document body is unreadable binary data, but the heuristics indicate a lure, possibly related to QR codes or direct links, designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • 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://laborke.ru/uplcv?utm_term=saw+7+watch+online PDF link annotation
    • http://ajeah-intl.org/fck_image/file/45757602305.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/zovujoxuvigimal.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/murik.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/87715322168.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/sufunu.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/93281902874.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/xisotokuseresekagisoko.pdfIn PDF document text
    • https://expomediainc.com/upload/file/88326821883.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134b87e987bd---tekulixetuzawoxiwumome.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/4952713413.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/78302014968.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/xazilada.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/70256402342.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/tesosi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f3ee5100fd76ed2d7b97775be721b25e/xafapikasuk.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/xakoxexagogusub.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/10561137595.pdfIn PDF document text
    • http://telecycling.info/files/file/risonudirowanopumodoz.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613093c77e2c2---54963507263.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/25289199517.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/23426772925.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139067074001---vipatuvinunebagunat.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/77409430830.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_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 18716 bytes
SHA-256: 5801c9a2f59e61b4ece82b7c777bfbbbe93cb025e7392159c928773f81852988
font_01_sfnt_off00012099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12099 10272 bytes
SHA-256: e60d1bdb0b25a5727d7ef54725ddeb0f9b45a219ed233be28b5e4a71f7ed2bb6
font_02_sfnt_off000137c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1