Malicious PDF — malware analysis report

Static analysis result for SHA-256 523eb17e4ee23172…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 08:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92fa0ab861bab1400d9739adcdac1f55 SHA-1: fdc582632016d99ab8ed42551ca2620734a611bf SHA-256: 523eb17e4ee23172decfd1250f5db60d6c781f5952f82271840bcddeee875caf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were directly extracted, the presence of numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggests a broader campaign to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://iieng.org/editor/ckfinder/userfiles/files/4968698927.pdf In PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/3338011782.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kinade.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c5b96ef58ed912df2fbecf177e90dc61/lamamoniradazeka.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/mafukesesawofaxozarogeki.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613522a89146d---votozutebunusukiber.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/zijitadixizaxel.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/65906523362.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/numabisilikun.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/bemevinebusorazege.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b85c0c61---malitusesepipogotine.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/69049355195.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/76432259017.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/regidunililepekufigorale.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/10406301266.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/25bbd474b4e3238b2868af95e48d472c/59731878368.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/54545979639.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613870453993b---76307068639.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pn3dj2d5gr2bpocg8hmquv9dt5/73751767516.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/29764019534.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161422b95c9a75---28714979835.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/nulilebukuzujut.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/55372902587.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/600ca030aa5ffa74ef9274ceab7c5540/jusabifoweleboladile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+ios+games+2021PDF 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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 17108 bytes
SHA-256: 3fb205c3881ddace5d5bb0f1bc2c4178fb3d83cb26369abfdf5508fe5caebb53
font_01_sfnt_off000110a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BE 10548 bytes
SHA-256: 4f960297d0c8cf30479973c0f2ce1b675b0cdae78711a3a15593ca1cfac455e6

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