Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ce43c290b9ef92…

MALICIOUS

PDF

75.9 KB Created: 2021-07-14 06:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4db2ec17427b69530650e26f8fd7731e SHA-1: 86ff93b63120a0917d8e5174c9ac64f3bc397026 SHA-256: e5ce43c290b9ef92e92d5fa6b5d1375db256a780edec3a897c3fc2c9716ae95a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm is designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=a+case+of+exploding+mangoes+pdf+free+download PDF link annotation
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952236cf2a1---kesutegapavat.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/76214109060.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/aa63df498d3a151179f529578eca2458/luwozipawujajefijaxa.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0d19029f19f5fcd6b0cadd0a03c5dab7/67383801586.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/47370093481.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74300027e---gifisawa.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076c7e25c639---71547759593.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/43766985157.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44a1612e9---73927189452.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/27713280466.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/d268t3u05ggdmbmkt2q6glsdb0/60801761198.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160940669a0f3c---43792680387.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210610_9EDAC674FD5DAABD.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/m3ed8n2ig440j7qnvoj30n68ro/88693319546.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f2a6c2b9---tapavurodetupudoxepubufe.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/tudobibojaderiverobaxe.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/reketapilixewa.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/kvf9kgms1jueishc4epocct0i9/kobewipodug.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/lolijuwudolesul.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/65472c0463ba3871047dc27bf632609b/39184049922.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/76250788001.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/15769446277.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2537b37e---42741816089.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5c0202a93363c91bd386439096736d4e/63475729563.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_off0000c43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 11032 bytes
SHA-256: 07e463f7c55771e15bad7b481aa71924ac53f470d8a6a66bc19ec296a08dd7e6
font_02_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 16896 bytes
SHA-256: cf7ad2c0411bd7ab2cf6fcc7785e848e67a0bbb10eec50a936b6fc27bc327b10