Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9c8f09ce437401…

MALICIOUS

PDF

76.5 KB Created: 2021-08-04 19:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: be392d1400a705dc1ee3d61b36994619 SHA-1: 915d12144096f685b3c8729cb114654bb60a7e05 SHA-256: 0b9c8f09ce4374017e65a7faafc4bf97ddf3420dd75764f73b0aa01dff1c36e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites and disposable domains. The presence of these links suggests an attempt to distribute further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/658648cb5a0c27b1a76feadf2c476599/45400680585.pdf In PDF document text
    • https://masukpt1.com/contents//files/gubusixi.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/tavekajigiwe.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210731183223.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/refonazepaliriborame.pdfIn PDF document text
    • http://toonesk.com/upload/34783604092.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/88523944833.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/2875366722.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/32510891268.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67760caf6e---36485091395.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/e70ivt08g8qvuj3fu7h3hjb1pj/92582566896.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/49495709967.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/mawebo.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/28187638130.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/naguduxesax.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a28a2b6b5c677ff76eee781f2c8e79ce/98363304854.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/95588873554.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3c73fea6---nimaxivobejorasuno.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/ruzam.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/ketokuni.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/76e3174bd0e74cd82833e0794da1f94e/78048603557.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/zupubusurukanuvodiximabov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=point+d%27astrakan+ou+trinit%C3%A9PDF 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_off0000c5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A6 10444 bytes
SHA-256: 0ab1a00cba86260ac2ff7f95876f9eb7f228d5559a89533d68171130001f411b
font_01_sfnt_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 17976 bytes
SHA-256: 6a887ca1ac07c8fc3a42acd76be4f822bb791c558a7be7da2a85646cc2ccae5c
font_02_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1