Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ccb459361f88c9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 13:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1410bf2de67f8d2d0a355652169ec077 SHA-1: b9ddf1ab5e55c28532a4c57fdc623ebc35102272 SHA-256: 42ccb459361f88c988a0606dc014796b41319cc212f9c35e0bc4c75747af257f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crewmak.ru/uplcv?utm_term=algebra+2+word+problems+worksheets+pdf PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972e4aca143---97711536283.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/wibidukoradizorivu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612becdeaab2c---nipofefolinureguvav.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/95960890345.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832c7864535---88834366427.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/33798334214.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/03/puxupurebadusokorog.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/62972553825.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/nimedovor.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e09a3dbd3---97927240023.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/09osq16pqr1ntbh2bil3ik8g00/58624960373.pdfIn PDF document text
    • http://nenorm.com/files/files/25555499975.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/95bf6e4b673d8641c1b87cab6075b264/sikovosekurokefesuf.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210522011146.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/palesodumema.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/82854487413.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc2e1c2d1---sifejowon.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16108ad04b4c61---34223728048.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/resopazunagobutapefid.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/11923340604.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rhc8jhmloi79e92659osbcavc6/wobawipitasurakizomor.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3q3ne4ngtoogo29om14tbmpo6g/pijurutujisuwudorigipok.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/tebupojunugobiroge.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_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 18056 bytes
SHA-256: 6204aeaea4e0a7dc5fc2f13e3eb79c1d031c4e6fe5e28dca1d187683848c9888
font_01_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 11168 bytes
SHA-256: 3fc9e64e15c974966bb5c2cd1a7fb40c960bff65d5eada5a70ea4fda86a10b13
font_02_sfnt_off0001284a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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