Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51906ae013a6f13…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 13:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 08466ceff86f8bfcb9c3e60960802c66 SHA-1: 6b759137401946b42a8846914915a932ea36b00b SHA-256: e51906ae013a6f1312362e445b99abfe53e16f6ba0c7f7420af38c0af1f4c459
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a specific ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=how+can+i+cast+my+phone+screen+to+my+laptop PDF link annotation
    • http://teewer.mn/ckfinder/userfiles/files/ximuzawojadebud.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/49057611078.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ad72086340cd5bd3e871362c2a3131a7/41803784198.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/16852065049.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nuzafupawifibusazusimo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139210a0ff4a---sajilamaf.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/94923216790.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/pusadomefidurusalopuwu.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/80767713028.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/78717392265.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/mejabune.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/82248714115.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/5297561490.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c386305493---59263792625.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/11462444798.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/4688123294.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/filetalatibu.pdfIn PDF document text
    • http://www.agot.pl/upload/file/84910035470.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/xijufabejojavomovek.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb18e4514d---lunaxe.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/50453480439.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/28577020390.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_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 17804 bytes
SHA-256: 5c09c0059133714156f371a4a082c699331a2a6ca8e95d214ce85a447cb47ef3
font_02_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 10832 bytes
SHA-256: 54d82cebd70b78d7a58a7d2adb2437f8f22cea669d6e4ed22ff8e9c78d968c3c