Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b963306fc58caf…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 13:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2dce57c71cc300c62a1dc7a3412e6241 SHA-1: 297b567cfe18afe07addf528778357fabacc7335 SHA-256: b3b963306fc58caf18cab2d2457d635d05b1da09fcf070790f0a9c86c858880e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to download a second-stage payload. The numerous links suggest an attempt to evade detection by distributing the malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://krisoc.ru/uplcv?utm_term=dream+league+soccer+202 PDF link annotation
    • http://ambulatorioveterinariocigliano.com/userfiles/files/34286555640.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4a8d069e6---genefobazeliwikesukesig.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/barizuremilebokuzigojata.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e5cb56ae---kugomokajudesivunej.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/75061065766.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/lunuwejadidovalosi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b61e80b638bb347cba6591cc70e87d4e/nadusarijovemuwofamexo.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/xowaxufiborimuwedafegu.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/dukoze.pdfIn PDF document text
    • http://cocoal.com/uploads/file/26382825363.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/15164348408.pdfIn PDF document text
    • https://wonkingchina.com/d/files/xopirore.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/53529966789.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fe131f122db9d007baab88ffde2a8222/gafagubak.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/35310189602.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/75279759208.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/nogumug.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/godapaxe.pdfIn PDF document text
    • https://equimat-cheval.fr/file/linusulakamatisupilaf.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/guxedaritawowikosikozowu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f66b3eeeac---84203928133.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/nabuwa.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/xepewasosefagujojopixamib.pdfIn PDF document text
    • http://scarpatti.com/files/putagugisor.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_off0000b5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE7 10620 bytes
SHA-256: 834e1847cdb4071d49e3b9ffaad306ab0684872336f0aeef67cb3df47fd6f11b
font_02_sfnt_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 16372 bytes
SHA-256: 58478197def98cd1d9a1ca374eb5d431515022c07237cac6a98d993f552aa3c4

Open this report in the interactive analyzer, or submit your own file for analysis.