Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead671b1cf6add34…

MALICIOUS

PDF

85.9 KB Created: 2021-06-30 12:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ee00787b5894b44c5ae0af5fdb06f611 SHA-1: a9bf2a4f1a86947f88bf2668223478630d87c191 SHA-256: ead671b1cf6add343e16720d338358d6139391479d556697027a428ebbcc9caf
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. Numerous heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute malicious content or phish users. The embedded URLs, such as http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceec1ba38aa---4023630833.pdf, are the primary indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://tischlerei-schlusche.de/sites/default/files/file/valufamusapoledijudu.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072b769ced2e---fopujuzis.pdfIn PDF document text
    • http://ubest.ru/images/file/17971227046.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/27b9c963de0fa7535c843e52b3583a61/75235210323.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/rotutema.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/0b4fbb384813d097f3671a1f722fdd90/jitikalalimededokuwo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceec1ba38aa---4023630833.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/noginumeguxinuf.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/81894636811.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/416e7651ce401cd38d0384e97e3da3a6/95501064695.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f71a2439f8b979bb0399828c4c3c72bb/judot.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25e362a7b---70564815472.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13b85d356c---77929217690.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bec06be53---61107311205.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607064f4abfee---48705893898.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/83559588026.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jggo0mnvbbmm4i1ia7478e0qcn/dawesuvasisorusar.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/delimowanowavijoxunofevo.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/geworasobijanexugewob.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c771ac9315---19015419472.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/99524300590.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/qln4er8f42imvs65mn43mqm8n2/71723149583.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/mejarilirudowekipug.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/152109479265.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/sanebenokakov.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/u4eg5t249thsps69omj7hfgi0j/jorirosuwekekadorojetese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=give+a+short+note+on+the+intensive+subsistence+agriculturePDF 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_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 17104 bytes
SHA-256: 5c4fb3243aaa68405964724058f5dc9e27a6b0b88b24b52b8975330522282f3a
font_02_sfnt_off00013075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13075 10856 bytes
SHA-256: d0183a08e850a64af5158c7819fa6cb62f529d703d1bc050b6ee6b918ab67765