Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de11650ebdb096b…

MALICIOUS

PDF

90.6 KB Created: 2021-09-23 22:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 414bb4be2c7b79f47a6862f12999b451 SHA-1: 9014814693a5fcf06515257401ec2da5f96249ab SHA-256: 8de11650ebdb096b9e7977286682f9ef1fee3eb2c2665915bfd8d82db78c8af4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. ClamAV and an ML classifier also identified it as malicious. The presence of numerous URLs, many pointing to PDF files on various domains, strongly suggests the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://egitara.com/upfiles/files/48379255660.pdf In PDF document text
    • http://qapoll.com/2015/vat/upload/files/85384813281.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf959b311---66237980164.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/91383905271.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/nolizujaf.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/wumonizirikegijepemitamus.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/timujin.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/56967616135.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/70937013710.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021916_195314_730.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/kezoxotagukebunolakidota.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/89394522426.pdfIn PDF document text
    • http://hak-al.com/resimler/files/gawafesovemafobe.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210907_788A69B1519B6419.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136864812ae5---rudorizis.pdfIn PDF document text
    • https://netlandschool.cl/files/47522252688.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb3a355a8c---19064799342.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/24760769616.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/majojogotejikutulesam.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/91309707750.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/xedefesevum.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/jamepuxid.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161365ba29e6d3---wawatupozubolibas.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/korep.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/19172491761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gfx+apk+downloadPDF 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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 10220 bytes
SHA-256: cd39d27d7253d3d328a6d48ecf9c0adde516c16e42dbc94c416424b0f02a9447
font_01_sfnt_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 20788 bytes
SHA-256: 0b9eef58721001d4f8d6c47e0ba43372f9b9970d1e7dda17f685d489f1cb2017
font_02_sfnt_off000144fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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