Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3aac3e10b3d294…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 18:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21e8c3aa74c8b7b9247cadf226f01763 SHA-1: 9c55cc9effb62f16d607631b04c8ad4054a93ff3 SHA-256: 4d3aac3e10b3d29434dcd5fbc43a8aa9be747c1df9d019abb7de552b89f47754
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable domains, likely intended to lure users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

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://allytemp.ru/uplcv?utm_term=gender+studies+in+tamil+language+pdf PDF link annotation
    • http://barbusci.it/maisUserFile/file/dosawotirujiwodizaliva.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee325c4d0e---xotudulavi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094547ed08bc---wujukasudupawiwetuvagu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5a2078c6dd7b83f610bc193d08877ae7/gekikitoriwuka.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/wofufenimanilagoxo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfa142b595---fatomitoboza.pdfIn PDF document text
    • http://screen.by/images/file/sebunonexopijumepidabobef.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210714/file/1626198461.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/simekunuxa.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/lazesoxirovobuk.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/520e571b2214af4c48a999175b0959f6/desabilaz.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/18924833205.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621475286.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb18ad8b3---72544315871.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/32438066950.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8efd91b23---wejoporajerik.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ba5da01a8374b53f91ac52251d0d5752/libijapesaravoker.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1626211316_4f0d6c56f1.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/53507464969.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610031a8735e0---15621034970.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/53703686725.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/18084667826.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_off0000cdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCF 18396 bytes
SHA-256: 30479cc9d06090f99bebb2326a0a7a064f804926e5e5316951c79f534376ceed
font_01_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11621 10860 bytes
SHA-256: aba5ee2e1b00a327e65783b5059d907beaa78fae65284fc678bd7b0ab23d3b9b

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