Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb62d2de89bb94a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 03:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 814c346b6e9c9e95b5775ca661449ff8 SHA-1: 2bf56e7dbeead7068635060a4121be293203a7b4 SHA-256: dcb62d2de89bb94a53535ce62828582104fa10b6eaa12d3840827a0fd51d532e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates a malicious intent to redirect users. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting the primary malicious function is within the embedded links and potentially JavaScript.

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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160987f59ec174---suruwisiwaxunabepidu.pdf In PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b2abc469d511523586c976fa3ab8d226/80710171691.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/pekulizawuwaxinas.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/cldg3mmmfed6aaimirm8s78v14/sujituxotufilajekura.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/71392391409.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0397e9a6459dea460940f22dab553c2b/6521029776.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607240e8d1fe5---vobidugatavezesejozoweso.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/71595592512.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/lalim.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/58683665670.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/83700912481.pdfIn PDF document text
    • http://blatt-gruen.ch/files/vufavadonaloxaxusizeveb.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a716e4392d1---biwiposamu.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/faxapivosebef.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc5f66493---sogukepijofikakare.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0a96534117db5b2f38587cf5e8a8211c/sijekenujadejoja.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/39162553561.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/nebigutumasabikadimos.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/timudinovovilit.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee246c12bd---gexukunojolavebive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=policy+interview+questions+and+answersPDF 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_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 10876 bytes
SHA-256: eeb8c9b66c83615c8680baba3f3576e1eecd5bbed276bd5542ae6c870ff1e44c
font_02_sfnt_off000111a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 17452 bytes
SHA-256: aef026902e2e17a4592c049c0c88d4a95134ce991ae39207a03ef5e1e6117617

Open this report in the interactive analyzer, or submit your own file for analysis.