Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c58e5413e5a145…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 09:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d1e551909b98ab5020d33cc9d66d0b6 SHA-1: 49dfb339bf06cb640805b6f774bc9f1c24cfe45b SHA-256: d5c58e5413e5a145577cc640df044ee5f518c79d62c520cd93623fe7e607fd57
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://pistant.ru/uplcv?utm_term=el+mejor+avisador+de+radares+android PDF link annotation
    • https://securitydm.com/slicice/file/50271403167.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/vesovejefava.pdfIn PDF document text
    • https://eventaipei.com/upload/files/29631487821.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/6207051430.pdfIn PDF document text
    • http://contelex.it/userfiles/files/14133067922.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/80365123340.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/18215454738.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143acabcdc8e---95956608393.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/67072588281.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/goxowuwemitamonamof.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc31e0ffd---jubobako.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/39033309615.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/2190597725.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/zaruvazem.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210905150426_1091946887.pdfIn PDF document text
    • http://charivne.info/images/file/49875228230.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/20222650638.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/94997397319.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630861171.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/merenisonebumunaxeziguze.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf387e32c---vebapebunudefedeseliwos.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/590367280.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_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 19104 bytes
SHA-256: 0048d30337ebeee1dc6193bb1f35fa4c8bdbdad04913e820d8acaeb32e02fd13
font_01_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 10488 bytes
SHA-256: 767f13668b7f3d3d8266ad755ffb134ec6f133790ed22d0829fbbe4e76a9ab04
font_02_sfnt_off000128ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1