Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6ec2c68662fd68…

MALICIOUS

PDF

90.9 KB Created: 2021-06-27 20:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2bc41ec427867c7c71f050ace152b8d1 SHA-1: f6a209156cd8aaf3c55990ddc2f78b0d9fb45ecc SHA-256: de6ec2c68662fd6837155741ba373438d07fcb3cb74893f19866625fdad8c143
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3988fdd50a246176e095dc4d07093793/31202900788.pdf In PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210619064905.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/26058541173.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/nedis.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/97862221658.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/26646202465.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa2b79eed---49793550700.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/japadojopesiganida.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9fc1f2d83---4511751242.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/mawizafad.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2749b164cb---18293174702.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/zosodugajosuzijig.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d874386f3---zagebekeviwazi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810e5875ff6---vinolipub.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feeba29c52---zefodixorulisi.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/80866565127.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/hhgdeqhsdrk9675j2pvgkqj16e/famokisojokegugu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/crtj1cngp1q0d14rt6h4sp1p62/bivozitimukure.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/sipup.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5e075783---garepusudoxuluw.pdfIn PDF document text
    • http://minerva-collection.net/files/files/24804377701.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1uk9in1gb1urgn2la3nd0k098v/kiletefixaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=blocked+nose+and+earsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 17624 bytes
SHA-256: 342e47735298faf30a92afd938d846bd9f504eb8a60dfda0320aa1521e8f808a
font_01_sfnt_off00012f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001476d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476D 10316 bytes
SHA-256: 63b92eebf6399c8e75a8e2bb852a2ee5c4c966c8e5c8406bfcc1c5c2a76c993e

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