Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5c6405af7cf3d5…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 06:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 325580a99bbd504bd9425d1ddb9553f5 SHA-1: b74787e4808f9686accd1c71a48ff193c954c59d SHA-256: 5e5c6405af7cf3d5a954d1c3eb1bb15410ac33bd33f7a40d90da2fc17dd1535c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

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.
  • 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://cructi.ru/uplcv?utm_term=encyclopedia+of+science+fiction+pdf PDF link annotation
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/sigiguz.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/66847365460.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/45736627284.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf45c5088a6---74157178055.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/zuwazitonutitugaxa.pdfIn PDF document text
    • http://jkohut.pl/file/bezogirito.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716d7a21cef---kerebefu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9b17b6bb---46465577629.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/29173483800.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/52964318995.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/94350355874.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/tevufexovudodoxopapasabog.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/redivubaberefedupinapiv.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210514194958155.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/61b49612f5aaf9905fc59ba0dae67d53/doluwegavekulezopawa.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612db373187b1---47019660746.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf370a57c---5106741177.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/wodiparikikudiwoz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mpr9f5pnsoj7ar8om2kjsfg2eq/27643656201.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6b70f298d---10731575533.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3d10f2b0e3d09dfa71b15bbaa7f64acf/zoxinekugeze.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/84b1831d4ee899d16ef84aef1c6e6ff9/68054426849.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/37715006249.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/90901895584.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/tubamupogebatekujovija.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_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 10612 bytes
SHA-256: 01527f97a3567086f0845f031e13ef14590a733b92df87af275718035ec2b8c9
font_01_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 17996 bytes
SHA-256: 5090031d7c3b319ff14ad49b40394af213331265c983197665261f8427c753cc

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