Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e68345625f0fe9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 16:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f69fc75f3ece56dc39627ee4296cdf0c SHA-1: 2e57f7341bb2541f4cb70e1a1ba629344d18c255 SHA-256: a0e68345625f0fe9762f15240e6da84ace23b2362a658297f6ecce447844bcd7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to a variety of websites, many of which appear to be compromised or disposable. The heuristic firings indicate that this PDF is functioning as a link farm, with a significant number of links directed towards potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://infrive.ru/uplcv?utm_term=exercise+on+gerunds+and+participles+pdf PDF link annotation
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/af2a92e4iomjarus248u9gmgtf/rovawomedef.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/1764541629.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/97097344476.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a564b4aff8---degogikumufunu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gekerewudagurizu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd0f0870d6---34011062581.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/mudex.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679f6431f7---gabiril.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710b2c0a73a---40214948547.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/vosofujodopafezeto.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/77389114577.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/99183228978.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/h9dd0sd4v0d5sf5mthpa8vdtkm/bopuvaguwevifijaxurub.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/vivevojegesogoguzadubuna.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/32999438112.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/38692742862.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/q96th99tj9031cleb3vd6mrj94/jajebobafukefokiz.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/loposikexi.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/691318336.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/xedoj.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/72592782839.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bb43e2480a61ff90f79e669d759438fe/pegenegabo.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/54120437963.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/rawulir.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/95969598337.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/33434006005.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_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 10980 bytes
SHA-256: 47886c1ac69cc78606fda244242188dfc2585ad88f417f9827e7e9468d80cecc
font_01_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 19684 bytes
SHA-256: 16d9d5da93e0fe15b57f0f0e155ed3fb126c3cf1fb504f327da14693098c7eed
font_02_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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