Malicious PDF — malware analysis report

Static analysis result for SHA-256 3463476ec73360a6…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 00:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 251fff594d65a08a7d2f75da4a5a2814 SHA-1: d9a9c33931fbe4ea7a15f1308d9da789e13882a3 SHA-256: 3463476ec73360a68a8d9634d510ab06714773c58fe0e98cd5a2d6aa4bf4f928
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded links, including one pointing to a raw IP address, and others hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics indicates the file exploits PDF vulnerabilities or uses obfuscation techniques to deliver its payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://damiel.eu/userfiles/file/10874984898.pdf In PDF document text
    • http://rehahomecare.com/upload/editor/files/89040806203.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/giruxekavip.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/938768fdcf5d3c86ed9a265a419ef43f/72074538957.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc92e2710---lofebeparanimitoguruvu.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/vubikovazesoruperoxix.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/21871648669.pdfPDF link annotation
    • https://network-italia.it/file/36245272361.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/kekego.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/faxebevarozepakafijejaxe.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb25399bc---rizisurojenobusisoxated.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/g5u2qfpj6vr5kp86ihdfupvrbp/paturavaselefalopoz.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060817531582.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/buruxamezepagomozijur.pdfIn PDF document text
    • https://proxus.nl/file/6009177649.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/72274156114.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/51999741975.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b835fe862d1---mekodegag.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/zexages.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/jozaloxunapabasusowabi.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210821162425_imrpp5.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/zikemarenixemavu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a5a9b29ca410a8f92a8587ee67623acd/datufagegemozudowovusa.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/26567875759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=another+word+for+spiritual+journeyPDF 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_off0000c113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC113 20180 bytes
SHA-256: db06137ebe67ab33d46bb518c750bbe3b888b6fb70f7bf2fcf0f99f9c688fc2a
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 11008 bytes
SHA-256: c8ee89607e9b4868e2d683558f49cecef31516a706a5a80ca8581a245ce91616

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