Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f788679abaf6d0…

MALICIOUS

PDF

117.8 KB Created: 2021-06-19 08:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 484e5c017178df833895faaaa013f58a SHA-1: 93fcbc62b69290bb6b48e4f03fb14593b925bc86 SHA-256: 58f788679abaf6d0b74356e9bc41dcec2084af42652ae95b5f2eb83af38efb93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cructi.ru/uplcv?utm_term=modulus+of+subgrade PDF link annotation
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac4ed9709---tirofezokafomanawu.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210602_54C122EF9255ED91.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7194d884---fufavarininugemato.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608061a7c4097---80090743160.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3097a769a6---xafamunesuxebaner.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/rerurumawijedise.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a6ba849e4---12115494944.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/xibuxidemuviwomegatifem.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/jixexezoturo.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/64294435504.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21061811024943194691k1k8.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608722b36a0e1---72946933640.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5946e47abc4c878a77871793309271e2/zilidetivu.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d4dca087c91c3bd54a4fe08efc02a0c6/15506639008.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/gefivudomomisalowaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00017151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17151 5220 bytes
SHA-256: 56f88fd7e05cec84adb8c0612986b365ad0a653a4c02afbaaf31c55f51d5d172
font_01_sfnt_off0001832c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1832C 13588 bytes
SHA-256: a22999d5cd1228e59cf57c121adc73cec2818d779ace35222e5e0c26fac3529c
font_02_sfnt_off0001b18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B18D 18016 bytes
SHA-256: 50d94509e5e4611527a017bd08150336e47ced44270cabd40b02eb87ff079f6c