Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92fde6d15c93d12…

MALICIOUS

PDF

77.5 KB Created: 2021-07-15 19:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a9d7d610ca5ccd1a5ea385eca9c2edb SHA-1: bd9e498a3733afba38176f1d41f04ae14d642ac0 SHA-256: e92fde6d15c93d123e8d9ad708dd35a0c465abd6b57254e2589e6d77f97e1215
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external links to potentially compromised CMS uploads and disposable hosting suggest an attempt to deliver a second-stage payload or phish for credentials. The 'Remote-support tool lure' heuristic further indicates a social engineering tactic to trick the user into installing or connecting to potentially malicious remote access software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=tuesdays+with+morrie+pdf+free+download PDF link annotation
    • https://nguyenhungstone.com/uploads/image/files/xolulepusisumizipuwezesu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/61303910060d1e30c2cea8.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/20997447138.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/gijunetinog.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zezopufekonereloguv.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/rotizozorubupije.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a8ba28b7e629d44f072e84f260ff140f/39403671930.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hmhatfl4v59u4er5qn1v3gk6m6/80362990079.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608eab19688da---tuzujisoj.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210526181444.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/46674038491.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/xubajol.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021613122354405.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d73dd441f---70134774494.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a643bd45eab---5014239766.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160be02264b427---59049965358.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/fa9917a895142fd6014f52dcceb600a0/58302437720.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/9845747686.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/476971433.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/43691282032.pdfIn PDF document text
    • http://iccarrentals.com/files/file/44585858187.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/pobidogedugutobolen.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/23692194539.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/jilavujejen.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

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_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 16680 bytes
SHA-256: ba159f7cb55455a2faf637c66f793339341692bd171ee8edd80c34fc6103008d
font_02_sfnt_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 11028 bytes
SHA-256: b82a83219132053d2af7dfcec8b7d82aee0dedba4f6dd93f95157f53730645d9

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