Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc33925d98072756…

MALICIOUS

PDF

86.1 KB Created: 2021-06-25 16:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4e6864ff88a4f9e23ddd36635fad5d13 SHA-1: 74705bde8e43c4bb0e56184fcf1f406bd9e30de9 SHA-256: dc33925d980727561447905a5ed973fa89f612f1bdc0ed5a307343c8d109b839
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of numerous distinct hosts and disposable hosting indicates a tactic to evade detection and analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://travelshops.pl/userfiles/file/12246038839.pdf In PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/43ae2rccrqs4mt3a847r912q83/29288219986.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/tozikinopiwinubabidib.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9c79i43lah9dddu0kp4pr0cvf7/15906889157.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d16480466---28471475311.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/gilizumovovivo.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zeromuzujabemem.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/72ffe01c0d956c843ca729d5721da804/gijoxewekopuruxokos.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/gomosojibafules.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/kivarilakitarixo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d7e06d31---gawukegobuvovibirokitud.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa4b8da136---40936704236.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/6131271959.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/12336692111.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/litifunesiwuxixonew.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3216ad33---xoweniva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watch+the+sound+of+music+123moviesPDF 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_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 11100 bytes
SHA-256: 492900fc9dbc76a000614ad7bd3f16c4bb715f0c9f97d7495763f963f2a8615d
font_01_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 17596 bytes
SHA-256: d161519cee3c59c244de06ecd58dd21923ec9d961a1ca74bf57c399759112d22