Malicious PDF — malware analysis report

Static analysis result for SHA-256 e331f6bf9ce6dde1…

MALICIOUS

PDF

96.2 KB Created: 2021-07-30 14:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3eb99daccad2e4d706cfc827dbb8e53e SHA-1: 91c93d80e4f5a92423ff30277f0404459c284df2 SHA-256: e331f6bf9ce6dde13ffe8481c27aac8aefeb3a3b3e34417b0cdc7c07717ce1cb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. These links appear to be part of a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba4dc3e915---toxogojare.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a127eba91c8---27964199385.pdfIn PDF document text
    • https://bamor.org/userfiles/file/webexovobobunez.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34a854f74---dapivosepivegomovuwitib.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/2afc0145f997759d666fc8a46812ef1e/moliwumafutaj.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1c4fe408339f5958c3861019955c54e4/jixikoxenesixim.pdfIn PDF document text
    • https://aneri12.cz/res/file/gedevomodekonobado.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/vifuzola.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9acf20e48---26521128535.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/duraz.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b249ba9bd9c---lelok.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/zoputab.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/janasuvomavuvojax.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/tovajavajasijanoxuzudej.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/ruvigoxas.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3ff609d4---3397808463.pdfIn PDF document text
    • http://cycling-software.com/files/file/mexemabedasusuvegizip.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/77f74634e50114c50b6abeb61105eed8/fatijexorizopakosaxofam.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///sakatiluguwafuke.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/98135313042.pdfIn PDF document text
    • http://abc-tel.ru/data/File/sanazetekizimi.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9ed3eec11291d46ddf7898fbd7bb9933/13407554078.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160724fee618d5---galofibuvepaxonogegok.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/zevogadusubexa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2b392769---83378129777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+solve+rubik%27s+cube+3x3+fastest+way+for+beginnersPDF 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_off0001111d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 16724 bytes
SHA-256: d380d72f6c35e73a057cd5c9c582a6937ad7b900f069d141d2489116c9f81cb0
font_01_sfnt_off00013c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C80 11408 bytes
SHA-256: 6de45da95c93a93a9f7129b609f1daabf24170eb34c5be1eea9bdd858d0f9965
font_02_sfnt_off000157bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1