Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c1205d2a1f4f47…

MALICIOUS

PDF

75.3 KB Created: 2021-07-03 00:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e8e495a4fca4254159529b256c7760c SHA-1: 6503d34090284a24845c02f3e4a2bddf0442dd36 SHA-256: a6c1205d2a1f4f47394a6eefbedece386c78f45d78fdc83b61d6e59c39b508a8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16078de30402c6---sodogomapawudopusulifi.pdf, likely serve as lures for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af722103f5f---60838002728.pdf In PDF document text
    • http://mopron.ru/upload/files/zuposewivojegi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdac3b378c3---65897336185.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/27466edf7d1c89d0108dc5dffc910c0d/6648513470.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/36ba8ed9f15981f6ff90bdd9dfb23453/kuzuvolivof.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/366794509f9b837796bb6133d544a42d/soforeliruzuwurijo.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/zulede.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a0a63ed0f4a06d8d2a0f029e6f6d6245/ponamojozezudiw.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16078de30402c6---sodogomapawudopusulifi.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/50946813372.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4a69b5cda4c9f055db74eecfc5088402/90971781263.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/74696724316.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a111247415---72058710098.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/58b016ac86b458c422a1f8543e886eb3/xekibulenonamuwelabin.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60df181cd---wuvuba.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/fujekuzavojiwarapiliri.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hu2a5156rpkbpveorcovqilq8d/vajudezaseruze.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/843e5256f942a9e98eed221e7a86edc3/rimobilufesapusefo.pdfIn PDF document text
    • https://mszukam.pl/dat//file/gefonetizuf.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/63612524685.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/bodixevazaw.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5742e691c---lutavexolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=anniversary+wishes+to+sister+%26+brother+in+lawPDF 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_off0000c4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 16580 bytes
SHA-256: 43df12bbb634694a536eb38aabc582ea0ac1ac7ed2ee7aac264ae81da2507664
font_02_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 10404 bytes
SHA-256: f9ee9df406ce1e6cb2d026dc475bc2accbef8bd50bce41b9217210772e8f7ada

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