Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe3e0023a66ac20…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 16:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fd915933d22a04fe68ebdd738d109c8b SHA-1: ccb3b5f4c812b9bcc11fe9c00994472b085b1a2a SHA-256: 3fe3e0023a66ac201dc22ae3ab961542197fa0e952b980002f71ea17dd175bbd
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appear to be compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The file's structure and URL patterns align with common techniques used to lure victims into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/nepekevufavikilow.pdf In PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/90690352735.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/sijisebusulobidafi.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/81895909924.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/polevixukoxinujun.pdfIn PDF document text
    • https://eternalbliss.net/file/82293432097.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/37477729503.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161307b9c12f7d---baxerusamezesifibopifamir.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/fokujujuraniwofofexi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a86d9276c---faxubu.pdfIn PDF document text
    • http://xycrusher.com/d/files/86262658462.pdfIn PDF document text
    • http://dhf-china.com/d/files/lupenokinetudisumepu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa871a9c6a787b8f4ea6c9386011e82c/56176388682.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/vekawekovefuvusenuzuz.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/sagute.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/zamepuluwafumigimira.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/13229358817.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/40365425968.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/26718813765.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/030144162639.pdfIn PDF document text
    • https://tebra.si/userfiles/file/40392619380.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/wibabub.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137daac297db---42540104890.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ab7d7b9c---golukovidat.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/79581122380.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/lasoretuzonuzomodem.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/87044688259.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/lematozedafuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+channel+is+joseph+parker+fight+onPDF 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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10972 bytes
SHA-256: 8331048181c439c3187835259c3341732993aaca5c82cbadd24b85b2a3112cb3
font_01_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 17796 bytes
SHA-256: eefe76db0f5f2fadc25fe0cc5b0c42171c79ea810fd926baccf6ddb61a93072b