Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91e3d3886c343de…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 10:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3f31788439f1d39a56ed441dd529a0a SHA-1: ccc23400cc6935e0607a315166b15abc0e153857 SHA-256: d91e3d3886c343dee76fa3c6ffa56ffca2bbf74db3426d5c7116a689bb6f5d92
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://modnyi-buket.ru/uploads/files/94266274423.pdf In PDF document text
    • http://rocb-ap.org/file_media/file_image/file/65105698089.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/61323471778.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/98588a9ada4ee1e1e41e3adbb870b931/vikenefozujar.pdfIn PDF document text
    • https://diphong.com/uploads/zunuzusenoginotux.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/fowaxixasuwiwukitiw.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/94682066440.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ce263dc247a1c80ff6a286e443f2e637/1422372951.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/patekekipitomudepanux.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/wiwumifujuvibefewux.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612179cfb7d55---mugofokuwizubifekovefo.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/kibamad.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610910162aba8---rikurasararorid.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087a14a11df8---dazekejuxidafezupozabor.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/81037646093.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2596npuidnsu80rklimvpc3ik6/7602391192.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/fuvojebodesaludosero.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06b06e36e03217c13ba690e4d8e06048/17163889277.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/59329085130.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6bae8ad302eea5decc83623dadb36b05/pigewasarebemipilaf.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/62360034365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=styxx+boat+on+the+riverPDF 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_off0000c43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43A 10488 bytes
SHA-256: 68d58c7b4506bde74915dfca866efb7f714c5c398a604e85a35f79b03cebebad
font_01_sfnt_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 17656 bytes
SHA-256: c16ca939a478b137841c3544a5cce6bf05beb14ad8924ea3fd9d4d77506da5e9
font_02_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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