Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5e4ef0228434ee…

MALICIOUS

PDF

100.8 KB Created: 2021-09-08 09:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed97399af2715104a532d8715628184b SHA-1: 30fed9b8a40d150767e57f68524adeabe1480578 SHA-256: 5e5e4ef0228434ee73239d11e9c520c9917fe1c5c930ee1bedba18472ae491a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://balajihighfields.in/userfiles/file/2158198326.pdf In PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/wuvefakadi.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/allhj58ocg3gbgfb6dsg2al7qc/73736701053.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b26c0efae---25815445019.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d28c29440---wogogebek.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084146ad6e3f---magadupagilizofivane.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/54802107215.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/lkbu1pegb7lm3a6110jpcl3kc0/numekovagomozivolitedi.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/15868878413.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/bukikofokesojorigedixavef.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/44142bba5be5e0b974aa87f16296959a/53208522606.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905e2b1d08a---nenexewusirutofumu.pdfIn PDF document text
    • http://rsst77.ru/upload/files/wefaj.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a29dd3e5b---23762212069.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a72574776d6---mevodobomiripusepo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90d1e3f52---31426300615.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/vaxenaragosivegitepavaw.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/40285888259.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2a24b788---33797198628.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/95670716523.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b10a2efbe---pagajagubufeguwoluvod.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/zalutesesuz.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ea33814f35238d35654d54a41fd3a31f/53436626790.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/tijefipomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=incredible+english+kit+6+teacher%27s+book+pdfPDF 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_off00012686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 17032 bytes
SHA-256: c01c9d399cf7bbd99d56de53b345a2118a16dd2ccce90dfc6c548b55903a3ab8
font_01_sfnt_off000152b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B7 11284 bytes
SHA-256: 89fbba9cb7da0ef6ed517c58f10c18f9a34f5271d02a1d53082fd76a1045990e
font_02_sfnt_off00016cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1