Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae3592c447fb1bc…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 08:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9a1703ab94fc199fea710cb26c6f4fc SHA-1: d6348a7e46105822a0eaaa195299ec5c66dfd128 SHA-256: dae3592c447fb1bcfbe7c48d0d78942e061b22e9af750b52a0be9feda703e798
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest this PDF acts as a lure, directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://drafthe.ru/uplcv?utm_term=adobe+acrobat+dc+pdf+reader+download PDF link annotation
    • https://music-group-store.com/upload/files/50811942746.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e274efcdc723f0a267a2f1b8cf8a67bf/neradejakexaromifexo.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/duvofisad.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/jojigamumifemewo.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/lumotonufugireg.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0f1859adbd5d5e7d2e1a865e9760a484/4138380085.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/mijudukidovarox.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/23212490294.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b184d865f4---86480568990.pdfIn PDF document text
    • https://activepymes.com/pub/file/51324734054.pdfIn PDF document text
    • https://attack.lt/images/files/befulizotamurop.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/53600960859.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/09e3490ba79e31598b5ff60ed0c04ab7/98335963745.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/23223503124.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/penifulowolusuviworufavev.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b16d51f29---52343746077.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7752e2d944---38102572132.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/74360959c819c0163ee4c59011ce329e/83745477999.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090cfb7465b5---kuwiwibiliwiposugodamowig.pdfIn PDF document text
    • http://clarasonic.com/upload/file/47503828365.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/penoritabesorikolitapi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/jevanosezagebozugozewuv.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_off0000ba0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0B 10560 bytes
SHA-256: 28b03c65a8cad4946c806b2b0fa1b24b372e08369b14e7a43399a02201869420
font_01_sfnt_off0000d21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 18972 bytes
SHA-256: 492f4abfcf5bc13ea8b32547a67d4d9ef391f26dbbad67e32b682b7beae037a8

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