Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5d421bb1a69a51…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 11:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ff44573546d3024791c684278434301 SHA-1: db5f877bc7f4bc2809295479183f7d38477577b2 SHA-256: ab5d421bb1a69a51722ac03c94e44cf55738b15572d581f839c157a89a0da279
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by multiple heuristics flagging it as a link farm pointing to compromised websites and disposable hosting. The embedded URLs, such as http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/39409715007.pdf, are likely intended to lead users to malicious content. While no scripts were directly extracted, the PDF structure and URL patterns strongly suggest an attempt to redirect users to a malicious second stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h3braq76v37q9u4mmd7h8vu604/42403108400.pdf In PDF document text
    • https://zaragozadenoche.es/upload/files/fofax.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/32654139175.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109241613098762.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/33217735015.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/51460462786.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/jifuwitonovejaze.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/29883628802.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/39409715007.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/poximuzexuzujenoxanonadeg.pdfIn PDF document text
    • http://quinta.cl/upload/files/fazudekem.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/49203239545.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/38783981430.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/67405263034.pdfIn PDF document text
    • http://vo23.ru/upload/file/87063731896.pdfIn PDF document text
    • https://masukpt2.com/contents/files/zafibezabub.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/vofolurarivijo.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/64563946070.pdfIn PDF document text
    • https://domilot.com/uploader/files/68051683611.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/5443851501.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161376d216c4ad---vonurugu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cac7d9bb25---kuvunilorarulok.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210909064227_591208015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=good+witch+season+7+free+onlinePDF 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_off0000af26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF26 15496 bytes
SHA-256: 833043e66429f282b0496f0a1d170a21feededcd9791254ab1f6b55f1af6d6e3
font_01_sfnt_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 10748 bytes
SHA-256: 52d83b4ee29b6ad70576b90a722873bb758dfbbe3a4bc04ed0d4d622627dbe72

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