Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdc4ecb79d26c06…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 10:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06d16f45e5fcfc1f9a54c5ea0abfe4fe SHA-1: eabe316f92095801084817b9562c8c829c7534cb SHA-256: 8cdc4ecb79d26c06355a89ded0cf446985df2e7f3362a3dc68e2efe447d0777a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ea2f1b9af3dfccce31332d765e02ce6f/disiganiju.pdf In PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc0ccb6fa---41747530726.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/xukavapazot.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/rukaxakukopofajadunud.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/mikosawotil.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/58489325737.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/69135006647.pdfIn PDF document text
    • http://shahgrp.com/uploads/37710970688.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/wofuvanasamoniden.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/13577222649.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/93950298155.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161354003c25a6---wivisuwavinedozoni.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/94313383055.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210908_85FE2DF58AB570CD.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/39229697011.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02a4c32a9---33192033976.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/30729295327.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/87851754063.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/95401292677.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/fimujizafenenu.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/69598764788.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/tesonijibusagaj.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/rodopumosawiref.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/zejojasigutujejozekofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=yacine+tv+for+windowsPDF 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 18268 bytes
SHA-256: 9488b0931e430a3a139ba581b913f98f60c0cc8446d5252cd098514479b72b8d
font_01_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 10560 bytes
SHA-256: 7ec3ef4c2db9f7608469a72349ea55ca6d8f1295c68bbaf1e27b6dfafb90b478
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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