Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ee6053b8a371dd…

MALICIOUS

PDF

69.3 KB Created: 2021-09-10 05:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6907a4e05410848d12032eb1cc1772fb SHA-1: cf1d4e1572c69a1f85a7e3a903824d661fc72922 SHA-256: 03ee6053b8a371dda849a7b2426bdda1181fbfe6c23da948db9b5691b79006c1
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicates a link farm designed to redirect users to potentially malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, aiming to trick users into interacting with the document's links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=the+handmaid%27s+tale+synopsis+season+1 PDF link annotation
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raregogisubat.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/sebesaxapitijanapimukoti.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8eksd2avmb1svt8gnlcihncpf4/tufidekaxadexeze.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/xamebawusubufakapaxo.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/64099362003.pdfIn PDF document text
    • http://cbstav.cz/file/namasesatepenup.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/72167005340.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613301a731127---91759778369.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/4580199788.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/wokekinepubot.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/dobajokasekimipilojuzo.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/dafiwuzubiwepi.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/rekesugipofuvala.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/64400778410.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/72131294466.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/wozaxerabomuvorufuxivama.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/tamorutolosinewem.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135bd00e7f73---29334723971.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/tezivev.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/zebalikajutetuxugumogumo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613992e24c814---mezoxiteraxawapijoloniw.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/81040013534.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/kabuvaw.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/40123814127.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_off0000b11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11A 10720 bytes
SHA-256: 2b035f04f77c868dd78d76167c6b5f73fced2e9d7b108b05fa3a867f8d170f4e
font_01_sfnt_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 15016 bytes
SHA-256: 358e58b37300545fb286238a8daa6b33394ceba236eec88b1cf26d6cf1c5c973
font_02_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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