Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d92b3b131ef840c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 23:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18e332c9226cd8ce80e1203dbe71f4e1 SHA-1: d83173a66150941aa87802724576552107424201 SHA-256: 0d92b3b131ef840c6aae89a5e2dc3a3f715cc1b15d4f2dcda271568264fbfcba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=rangers+of+oblivion+ios
    • http://canavesiobruno-architetti.it/userfiles/files/bojoguxaxufu.pdf
    • https://hsse.hssanesteban.cl/files/63177937035.pdf
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/gixowunubati.pdf
    • https://elminhaj.org/userfiles/file/2550637330.pdf
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/3254763233.pdf
    • http://amuseonline.com/absite/userfiles/file/noxar.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eae46d2d1331d96a3f30c8bc1f71a3dd/woxinukegos.pdf
    • http://ltpbetel.ro/userfiles/file/xiwow.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613298d84711c---18014097435.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cd2b693d1---sujavanatiwezidikibotix.pdf
    • http://daivupaint.com/img-chamthi/files/38619537159.pdf
    • http://baovekhucongnghiep.com/upload/files/24248103020.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16136938dc2e37---67433232579.pdf
    • http://www.awakohchang.com/image/upload/File/4435363650.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161395c6cb16cf---12869387544.pdf
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/72234956350.pdf
    • http://mariondhuique-mayer.com/data/file/jojakuki.pdf
    • http://joeun-it.com/userData/board/file/49353938025.pdf
    • http://domkomplekt34.ru/attachments/file/29486433093.pdf
    • http://franceplus.fr/userfiles/file/nitirexejatasivix.pdf
    • https://legouic-peinture.fr/userfiles/file/wurirofiwezagegox.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/41323098359.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec5.bin
7077df54d3b15c8f55d546e7a72751d0ce2acff035fc7ae946d05dff4c7b57e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 10540 bytes
font_01_sfnt_off0000e6e9.bin
171a894dd964311ad2bc27dcf1c498562f8376771566cb60cb2dc8102908b653
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 19848 bytes
font_02_sfnt_off00011995.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 16792 bytes