Malicious PDF — malware analysis report

Static analysis result for SHA-256 168b86c8083c95a9…

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 21:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cdd5fd4dc13d1619de88dc297ff42c2f SHA-1: e12b2e4d22b6d29a2ae136dee19314a2c40f60ea SHA-256: 168b86c8083c95a99b4e43001e80d440749bb44e35fe65f3c96b502eb8c34442
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS upload directories. The presence of numerous links and the ML classifier's high confidence score indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=reface+full+version+free PDF link annotation
    • http://fmmvn.net/userfiles/files/8614545509.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/tidaxogoteduwodom.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/46d2447cd31ff160397bdf0f018daf4c/debiwepazukewebuwiwofaloz.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8892e633facb802d9a6b4e1680d22c7e/88895415285.pdfIn PDF document text
    • http://sial.pl/galeria/file/genufagilevomusogifik.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/11019936473.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613922164972c---jigugaxibasejidanet.pdfIn PDF document text
    • http://446888.top/userfiles/file/76778143948.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/zetatiki.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a9859d6367f2306a4b870b443b7cd221/sevotobezej.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/62898336074.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/totenomojomixefo.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/27037705865.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/i2n47r33gdr99t0fd89m4e9oi5/3514269633.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/tefufapu.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/ronefekezofodevad.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/salelemubavutamo.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/ribovidozomexenuxokasak.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/tifarisudal.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/10803919074.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/90768628178.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/81091005261.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109011329494184.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_off0000b447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB447 10440 bytes
SHA-256: 1ffc30a18efe16d7687489b67f0584cbdf418bda2467a82f08954f3ed8092dd2
font_01_sfnt_off0000cc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 14244 bytes
SHA-256: 338256639e8c654cd0976daa1a7288d414e24f9b571866e0371d02d077c0e190

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