Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0737f27a02c704…

MALICIOUS

PDF

77.2 KB Created: 2021-09-21 13:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e444437c511a951141b8e4ceafb6931 SHA-1: d55d5f7d2eaac991209702f4466dd152997760c5 SHA-256: 7f0737f27a02c70416520ebfdd2bb0ef2bb6af1d2bc6c15b1d8a923113afc79d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=tasker+tips+and+tricks PDF link annotation
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b783d5b724b0612572c6629ed9c4fd96/65544225130.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/lanusopobiwazalikawaxewan.pdfIn PDF document text
    • https://proxus.nl/file/40629034609.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/16535558518.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/65098304563.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c513e795c3098d6e87898d8a0b207863/toxuvisovujavovitusini.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/75734151575.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fd719c7ab0e1254911d45d243c960a80/80513775903.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/67931786699.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/zefedubabafoteguso.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/66157817094.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/winirifogemitunejad.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/lukunamutitigiwug.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/xetolepadakepusedaxepep.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/80081115888.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/81383266556.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/22590006980.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/rifexu.pdfIn PDF document text
    • https://blokhol.com/upload/files/33160699720.pdfIn PDF document text
    • http://orem.mn/uploads/files/pivikixamodutitudawuwe.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/virumolevoko.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/xidupoguwoxovagubix.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138a7dce850e---47463258696.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_off0000c6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A3 18744 bytes
SHA-256: 7952c3050ff95abc07827bd2f30bfc1beb7a62b8a96412236d110757db837551
font_01_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 10396 bytes
SHA-256: 6e300c432eefb7bb211a265ccbb611e6aa361bd6f38a43554a0863d11c699ca4

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