Malicious PDF — malware analysis report

Static analysis result for SHA-256 515f3db3f5badb4c…

MALICIOUS

PDF

91.7 KB Created: 2021-08-08 11:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81b82d90d2f948912f1a90d652428ef9 SHA-1: 14460e290bf2e9d881703f1ad47fdeaa0c3c0129 SHA-256: 515f3db3f5badb4cc33a0979a455bc17d939cd01a5b870350d123d747a0db7cb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic. ClamAV and ML classifiers also flagged this file as malicious, supporting its classification as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0597ee150388b0dc27822a2f83731f25/popaxizarefasaluf.pdf In PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c69e6ec04537d24b2c8ad845ded6ce1c/batowapurugetux.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/sozizojirajonisusidezake.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cd632fef875d6be2ea60d39862320cf4/xifulitogevafazuxidap.pdfIn PDF document text
    • http://normel.org/files/upload/file/81570441946.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/verekag.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/80798222070.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/20e07434dd1919d414f278bff8c2b4e4/62598037797.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e295e5cd---67210217993.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/balidenenu.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/3e025d9c3fefe18211c2c028cb70fa82/daxukulogu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a60feb56ff3---soliwekabegibugekuro.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/aae62d2f4abe886389f75adfce606f89/pasol.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/kesodezizojubezoda.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160854835468a6---bevegenegasekebupofa.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/vikvll4ttafol8r42i23akr0pr/pupivubopoku.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baa480afd7e---jitegofavunikojutilexiza.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2b65000eece335b33933d5135c295e25/delisuzuwofemu.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202107212204489156.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c44c63466821be5ce044f71c1abe873f/falamasusakine.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/31493557761.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/mibajulavelopuzireli.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/462ecbf6d906a1681554066cb57b12ec/nababofezowezut.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc6d0ec5f4---9944197058.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210802162503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=apple+iphone+case+study+pdfPDF 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_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 19216 bytes
SHA-256: 4f1001c28433c4694ba95fdd9f75809eafa1e38078a2feb2bda287479ef5427b
font_02_sfnt_off00014704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14704 10812 bytes
SHA-256: 602d335dad54de9754a12e7d5766a518555751ad6ea3262783bb0fcdd1b89cc0