Malicious PDF — malware analysis report

Static analysis result for SHA-256 684c7968d58d30ef…

MALICIOUS

PDF

97.1 KB Created: 2021-08-08 12:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 178917e7e8e81ebf0e58f2c7b47a378a SHA-1: da3470f43d19504dc3782e852cff0f9ea514d8e6 SHA-256: 684c7968d58d30effb69992f7884dda3a57efb5205a622568fc10669b17762a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=tom+and+jerry+movie+2021+review PDF link annotation
    • https://matrainagycsalados.hu/userfiles/file/74635773922.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccaf5eaa06---87991468634.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/amv88ejo8bn44j49dcbko0u691/65168883488.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8e7e77f101024902d0dcce0eb1ec2aad/dufawexiwipomutu.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/xukarileboniwosukuzowapes.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/59817465454.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be2ec8b627e---89073954557.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/sidijemagelarifaxuju.pdfIn PDF document text
    • http://bakefruit.com/uploads//files/202108050509188398.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/39291721359.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/lei0scvgsrmopg85n542l7ku0e/pukixubinunojolixife.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/75582516438.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/tebewonunikurugifofi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ed7j38e0du9gh6maf4lcl69r15/lopaparedode.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/mizafonirarelewifiruwator.pdfIn PDF document text
    • http://poorclarescork.ie/images/nowot.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/91790642043.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e083a1d674e---lojatuvexora.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/17054775656.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f862051dd2---jiwatesamilapazebozemiju.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/39295729366.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7aa173bda8a7b3251bfe34a09146c397/91232435781.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a7h4nu0664oe421gre2bjros68/werizisakura.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076942fcd5b2---wokinemil.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_off000117b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 10752 bytes
SHA-256: 1c3f791aefb41dc6bcad9824c6171a2c21f544da416a8427c01318d080002dbc
font_02_sfnt_off0001488a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488A 17556 bytes
SHA-256: d00e4f1a4df2b710f1a0603339388f8168d347aeb1adbbad6616a452d144b021