Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b76d08318888b8…

MALICIOUS

PDF

96.6 KB Created: 2021-09-05 03:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38972828816b0691a3ecb6cfe2fbb3f1 SHA-1: e696e8f6797876b9a50ed48f0456653ff720979f SHA-256: e2b76d08318888b83703961a9e5db848f23beac70479434a907d633379ef3180
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users by directing them to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://palcev.ru/userfiles/file/rufoxezanikeda.pdf In PDF document text
    • http://stylowa-pss.pl/userfiles/file/naralivedesiwulawewalax.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7e41a03fd---nokofakiw.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0f537300239ccd9ea35520858317eaa3/vesuvikenigunofew.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/6bcmph5d2set4c7ggtu7ru7kc5/pawekixisolunijimexunenub.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d088b9d3---zudejewuwukimuz.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/13258534734.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/letuxiterutolipabemidi.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/34439971337.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/dukedi.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/38032322845.pdfIn PDF document text
    • http://charnafamily.com/clients/60216/File/tigodaneramofubufu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7df0fa8dcf09402e1a32d9191a6e7bef/zekeguxalamuzowajine.pdfIn PDF document text
    • http://espicycooking.com/files/file///32241699952.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/dufenolule.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/tatikotagejikepaxovav.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210704063845222.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/41055138708.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/45735790972.pdfIn PDF document text
    • https://eklyps.net/images/file/pivutuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=summer+solstice+story+pdfPDF 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_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 10804 bytes
SHA-256: 9dc0ca475ea8903e6b7e845af582e309db6bfaf2a6ddcefc9ac329acaa1946bd
font_01_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 18772 bytes
SHA-256: 2fd920444f73bcc02b1d061d30424bf700ab01d4188d3cf210b79bc4011364a9
font_02_sfnt_off00015ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1