Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a2fc9532d0e16a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-14 11:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8b1a8f1b8dc0f07cdc6ac392a412241 SHA-1: 3a40048b5ce63784a351275c170f04167b2b7b9e SHA-256: b3a2fc9532d0e16a527eff34c5ae4352ac1a0bdda44aa38e35980412b401ba7b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://haohanlegend.com/Uploadfiles/files/83001232434.pdf In PDF document text
    • https://cepatdaftargroup2.com/contents/files/vakiduko.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/55924580009.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/77736184784.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/37508573755.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/21864027087.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/tixegef.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/56234876177.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/67211509969.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/89697086114.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/1368481111.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161309148e3a31---denijeduv.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/pozipowadudavivuluzoleto.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/xesumasudewibe.pdfIn PDF document text
    • http://watch62.ru/files/files/pogubaz.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/logokasasawininami.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b47c33b92da1726027c617f02ab0628c/rajexuwanaseb.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06641792d---12456886544.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/4029477574.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/rebugigas.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/44163156834.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/nizilaverizofudasi.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/74961086313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=app+for+tv+androidPDF 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_off0000c332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC332 16456 bytes
SHA-256: 83e30da3cbe69a778efeaf1e283c94591d6b7e5c8b18d8e8810b35deb679c98d
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 10192 bytes
SHA-256: 1af9bc3838f7964bf5e94f178a2757ccdfdb080b03bcc1aa1748b641cbc40ef1
font_02_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1