Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eccf4de55e7f7c1…

MALICIOUS

PDF

70.4 KB Created: 2021-09-05 19:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab3477092e8a67a2190b1c5cbc5f9376 SHA-1: 05f4562ae87eaafb4e9eefab647a4fe1ef0d140e SHA-256: 9eccf4de55e7f7c13bf732f2d693cfed20411a171d2cfbed06aca93f9b0bd59c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification further support its malicious nature. While no scripts were directly extracted, the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://skyzoan.com/cake/beta/userfiles/file/kozavulaniworowetolezo.pdf In PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/89768137177.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/2906822056.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/dafexubodatu.pdfIn PDF document text
    • https://wineart.online/userfiles/file/26837372507.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3ikt1gb8nil5ms41vpdn676rh0/13276010911.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/63671092395.pdfIn PDF document text
    • http://reunionclass.com/clients/7469/File/numudej.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/67895058238.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9037ecb3d80f81c8779fa3b025ab7750/98565179450.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/45042562498.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/1188556965.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/32366706183.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/nuiu65fa9do62j3774vqt78f33/16168327369.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/kikagovirazixub.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b72ed4853eea5c43c0f2de57b64682b4/makifewilonefiximut.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713d4b6b1db---90273431227.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/89185871149.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/sekivo.pdfIn PDF document text
    • http://01host.ru/userfiles/files/75146717875.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/jolajoz.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/34497769430.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98595819042.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/firepetewu.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/vimoweb.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d916dcf56---fuvujasovusofuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=encrypt+pdf+free+downloadPDF 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_off0000b507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB507 15276 bytes
SHA-256: e4f2bdaec5524ad82054173b960187e8516832b81dc3cae3d92809dd1e7db778
font_01_sfnt_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 10536 bytes
SHA-256: 11bcb1871312e87fe7b6c50504754d0bc9c5a50cca1af45b61b251bdcb9362d2

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