Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd109513d180541b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 14:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a38a917d2bcf9b28272b30c49c85096c SHA-1: a2c74ea5d2b1747ae0323bccb2ab46d847d3eb2d SHA-256: dd109513d180541bb949eb99f962d46d1fd8533abfb8a7c65fa0b6b927921327
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to external websites. Several of these URLs point to compromised WordPress installations, suggesting a tactic to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=android+deny+app+internet+access PDF link annotation
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/74531667792.pdfIn PDF document text
    • https://lapakunited.com/contents/files/givazakosupepozojas.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/fasulalowikamelisapole.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/04be77c228533467f9393c8b3cd6754d/bapaboponu.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/88453979594.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/bupujeli.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/81730720540.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372aa03c498---tikokumazaniwijekog.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/95695840996.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/wozajofukem.pdfIn PDF document text
    • https://sainaudit.mn/File/4622633768.pdfIn PDF document text
    • http://rideco.hu/upload/file/xoladadotifosusewasobuto.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/tabapapetibeve.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109100123466474.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/47371655154.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/ruzekomibezetogonabugo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136be24acb5b---42165620187.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/12364948035.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/rokaw.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/47781869046.pdfIn PDF document text
    • https://luminex.pl/upload/file/kosonizixifefiz.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/45375699855.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/860589732cf321db329cc0385919f612/67395517803.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_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 18236 bytes
SHA-256: 70ef22ddec46fee76e9bbe204c1993fd25a4501be7233b34c39c2bbe54bc46d2
font_01_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 10556 bytes
SHA-256: 4bbef30bc05dddeba21bb7495c700ab05ebce86fba2fe1af2cc71ff299bf563a
font_02_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1