Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59e77ca27688b0c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 12:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8109dbd0799921776a0bab5fd02dd30 SHA-1: 32bf3167b028c65435558255c0f5200268d2c873 SHA-256: d59e77ca27688b0cf34c9965797f16baa549e15c196f62cfdf539a2aa1f927f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to disposable or compromised domains, strongly indicates a malicious intent, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support this assessment. The document's structure suggests it is designed to lure users into clicking malicious links or executing embedded scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://armenia4d.com/contents/files/90489532620.pdf In PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e7ce356e4612c8d3226d8b941ecd06a1/koguboxe.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/raxupuvufim.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/6975212097.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1618236c---14198198586.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/dedip.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/keguxuzuwafularofawujode.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/bufuzezazemanorejiz.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/roxewubetivuvusunaxamulud.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/gofibalujanusifibokigu.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210909175418_742089906.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/zogovozixakive.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0cf8a70d---43812496141.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/7833753881.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/73789051932.pdfIn PDF document text
    • https://podimercrm.com/img/files/15361186631.pdfIn PDF document text
    • https://armenia4d.com/contents/files/16976826908.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/xotolufujelujimujuxeru.pdfIn PDF document text
    • https://unaizahic.com/Files/files/raduxewoxawod.pdfIn PDF document text
    • http://decorstore.eu/upload/file/93957227647.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/i8avhb48lr914qeuscj35cltfd/tuvegomi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302ef8374bf---94775861730.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/n95296mug3lfaaevp0mstmd0m6/20043366654.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/64417005166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=and+to+think+that+i+saw+it+on+mulberry+street+pdf+with+picturesPDF 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_off0000c17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 16908 bytes
SHA-256: 597154ccac3c795f200d0d13f76595ddbfc469df6747acadf53b0d7a1719ccf6
font_02_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 11396 bytes
SHA-256: 17a3115199808ec94a252954072c4014e204844a6b18ca9b6cad7eaf4600be11

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