Malicious PDF — malware analysis report

Static analysis result for SHA-256 6261718ef4cd6fe9…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 16:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa3f732505ad8d5a568518a03f4eeb8e SHA-1: e08e5896d4f0d38789168b5092343e8b74832dee SHA-256: 6261718ef4cd6fe932d623ed278b96dea21d21629110e6e5eafbc65ebcd551a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely serves to redirect the user to these external URLs, which may host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://jgbt.us/pds/userfiles/files/1275220476.pdf In PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/95528127914.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4601c3739---23338173849.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/22af11ddc3107de3dbc5c555c05afd57/33092250701.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/63252274552.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/gofumuxojud.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c0a29ddf---57487325560.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fe825334cf5---pezegilozetazufituwirip.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f12acc59a---86108556598.pdfIn PDF document text
    • http://sdds.be/userfiles/file/pozozusilabizifumofozege.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/l1aimr33atjfe5h8t1q8c98v53/pijexomilomuji.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e8f7a40f---27032559006.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af78b9bc2ae---85330582973.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/tibogejamis.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/meruwudesukoladanunamam.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/36881704008.pdfIn PDF document text
    • https://irantruck.ir/data/file/volebitewazetakoravuti.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/vivagup.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/8830549269.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/kukalonovotuxolasino.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210825030706112484.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/dugata.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb45568cd---lepukekeralad.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/d29a2e7d4f8c60bdaf86d2a0492428e8/pejaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=commutative+property+of+integers+under+divisionPDF 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_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 19836 bytes
SHA-256: 1a92ecc189fe327f6350ce7027f34f04b92a82ba571da670a4864caba2a89480
font_02_sfnt_off00012e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E35 11104 bytes
SHA-256: 0b60107e12a5ba0fbf57559f420a49a75cbc1293f7a9c5a9f28b8f845872330a