Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4dbb948c61c9b4…

MALICIOUS

PDF

86.9 KB Created: 2021-08-20 17:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 774ecdc3cce601d046312a31e9f117a2 SHA-1: d9cd476fdff1dd2a68f40a8738926d9944aa9f3f SHA-256: 1b4dbb948c61c9b4c97d5a843793a39e90480eca0fe303538f6fa6667e816a4b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://robert-zauer.cz/userfiles/file/74567932988.pdf In PDF document text
    • http://nextgt.eu/uploads/file/nadagesimojevatefisume.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///suxugaluxugadifesorij.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/30543043378.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611b784a470dc---wuwavawivowivejesopavos.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/79978392791.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/tovafi.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/12697108685.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/tazikaxoxilojuk.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a83fd415e3f---fovukaluvojimuf.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/0c8598df5368e7c9325dc5c6dd058144/zamek.pdfIn PDF document text
    • http://marymo.ru/uploads/files/fexiviwiwe.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/xokotam.pdfIn PDF document text
    • http://amkchem.com/upload/files/74332066604.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16083585757e4c---8617810329.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/65322292681.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ac0f684b4---51328418844.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/lomamuke.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e3a13a3c---39424364263.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/699b2138c35d83973a0e31fd27ae6df1/pekiwapumukemaso.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/golet.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/zemafidujovuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=exercice+corrig%C3%A9+compte+de+r%C3%A9sultat+diff%C3%A9rentielPDF 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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 18348 bytes
SHA-256: 09c0b3b619633123e421ce26af9ed997cfe52cc4819557dda3bd411e1cd4ae7c
font_01_sfnt_off0001189b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 11300 bytes
SHA-256: 951ad01a8816319fd846e2db351fe351d376187c0df06d41be48e5821189319e
font_02_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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