Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b720386fdeb7b23…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 02:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8aea71c86f2faa7863483573281357c9 SHA-1: cc15df10b836737266e26b9cfbdfa1a23e462971 SHA-256: 0b720386fdeb7b23d5576628bfef6a3fc171e5cf2de2a5fdb33434c46ff4abfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or are part of a link farm. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The heuristic firings indicate a pattern of link farming and the use of compromised hosting, suggesting the PDF's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=how+to+remove+split+screen+on+android+tablet PDF link annotation
    • http://kachelofen-prommegger.at/kesivaxubiluj.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161455a2c3c499---vozotatezakize.pdfIn PDF document text
    • http://gaudi.tw/upload/files/84703121954.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/bivufixaxu.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9358d00fe---21448837445.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/32284445789.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/mavom.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/22410637646.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/97391782283.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/bobemo.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/95556957148.pdfIn PDF document text
    • https://costarica4d.com/contents/files/45581479881.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161345ac5d6218---xufulorok.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210907124535.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/55000049774.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/kadiwapenunapexegij.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/99994161138.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/18234713787.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/9499184633.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/44918142040.pdfIn PDF document text
    • https://objednavky.dortovapohotovost.cz/obrazky/files/67564092828.pdfIn PDF document text
    • http://warehousetraining.ie/images/92868276296.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/37475345657.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3llk46gj247vqlu8iuch372jse/wiweregeve.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-24/20210924173439697753.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/10d740e19d8d73220de9ccfd6bdd7372/nemeda.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/tiwered.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_off0000b590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB590 10956 bytes
SHA-256: 86cf34b8c9d908ddf099f0fc0f001ee960525516c804c4f53c1c5d09233fad9d
font_01_sfnt_off0000cec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 17672 bytes
SHA-256: 19d74aa784aec549cedfae0c5d475ebfb988c155fb4cb82099b4b0808defaf38

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