Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c3f0aa5ea7c7d5…

MALICIOUS

PDF

91.4 KB Created: 2021-08-03 11:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e833b657c47d16eb91dcaab0c07abdc9 SHA-1: 4ad79d43f1669b03c98f26e7b1dc0b1e9fe8dfcb SHA-256: 85c3f0aa5ea7c7d57e8659c67bf0c8a7bb7381015aca1a42ffa650e5ff9641c7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cristalensi.com/public/File/52905387524.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbdfea13af---38071181759.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/29309750368.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/23155212631.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/96e61276888ea84aa8fc4ea57871a1c2/sigamozizogetenupos.pdfIn PDF document text
    • http://rafaelokazakov.com/file/67604947203.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/mibonenekumaxiwofiv.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/dd7a439e3853b98fefa087a00e796705/tezirimipewam.pdfIn PDF document text
    • https://maviet.vn/upload/files/46993975370.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c589dbb99---71172778454.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210611_191341.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d48ecec84---45424596014.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/1446499420.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/0iv4hlakl0q1lh878jlofglnr9/funusenapo.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/24122166958.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/gizobotuguloxiwa.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/jirivinutejamaguweninado.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876663179b0---paxoli.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0356dc954c---xejutuj.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/87881314358.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822bb8f2aff---57319772765.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1272439766096c1f12de6e.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a48343157b0---76287728565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+difference+between+renault+sandero+and+sandero+stepwayPDF 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_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 16684 bytes
SHA-256: 45097e1011f6db03756c276a175735d4cfd401f3ab96eef319e43f1aef2071b8
font_01_sfnt_off00012c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B6 11148 bytes
SHA-256: 261dc2e154149f02f77024580db0345fc2cc3ec5cb91dca865cfe69ca5cb92c6

Open this report in the interactive analyzer, or submit your own file for analysis.