Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4d0577eed3a5da…

MALICIOUS

PDF

82.7 KB Created: 2021-10-19 05:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f142ab09b4b71d51825dd8bc5a0aa6d6 SHA-1: 78a5d2e9e85f8c0dc318aca633d82aa6c0a16df3 SHA-256: 7e4d0577eed3a5dac0accc4ed75b535f89a6a3d22c0b0097a105d36ae6cf7593
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=how+to+choose+the+right+candle+wick PDF link annotation
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613649e88a670---jokumamunibiviluzezeg.pdfIn PDF document text
    • https://penzion-palice.cz/content/4500366560.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/71787955991.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16165db7093be9---gesavawegofe.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/lifubu.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/ximidufobavonelawaki.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/nozafikiboro.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/bigiwudoxusalipekisiboj.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210924/files/20210924130315.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/64366326448.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/95565985018.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/fefufibomejanefof.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/10/files/211010232823.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/93026298423.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/47550685434.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/kujukotipafutajewezo.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/80884419341.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/77582116978.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161466a2f107c9---nokizirekopu.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/watul.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/paxizagofuroze.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/roganigalifikex.pdfIn PDF document text
    • 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_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 10820 bytes
SHA-256: 77d1f8ed3b36469ca53853bca15c7d7c5e169a52511e1605a792d7a235ea0807
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 18400 bytes
SHA-256: 4ab463ca0389200d9b7b11fa19460a45504adebeb91af93313ad1ede657a2048
font_02_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1