Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcf94d360df846b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 12:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86f0e941c31d1da91f22c63e2bde93f9 SHA-1: 01c4ae8a5040257db1bd9e26a90e556ca871120d SHA-256: afcf94d360df846bbf69c102261013cccfbcb9907d54f326bc64767aed0aa77d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including random and compromised CMS upload links. The ML classifier and ClamAV detection strongly suggest maliciousness. The embedded URLs, such as http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/wexejurodopoxutewadujenij.pdf, are likely used to download further malicious content or redirect to phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://groupelamiri.com/uploads/FCK_files/file/zumedenobopukiwosepuditub.pdf In PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136e9604b87a---xivazexabujutavini.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f7a7423c3---96947962213.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/24663940962.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb94a76178---71105921527.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/75c31c4f869b26f33b629e0dfb096947/padutuluzomalovum.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/8224319326.pdfIn PDF document text
    • https://tepihtrava.rs/files/16829705390.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/vabilafodufuzowesofapanav.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/wexejurodopoxutewadujenij.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/dazugolas.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/69415786690.pdfIn PDF document text
    • http://rideco.hu/upload/file/rinevu.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210901220926949502styvoi979gy6.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/wikifofilibibena.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dodedokigiri.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/83888811466.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/lubewufibikukizigi.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/kolanu.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210904_12838C0EC417B450.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/nibuzaludetanevop.pdfIn PDF document text
    • http://marquisdecor.com/userfiles/file/54482963658.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/gibelewofenoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+turn+off+voice+assistant+in+mi+tvPDF 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_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 17996 bytes
SHA-256: 9bde6860dc4c0ce491d9a9e7d07cb9cb44369d4c56fc8ab490ee451a87aedcc7
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 10692 bytes
SHA-256: a9178024031d31dc68019e212e3bc1df2c5eda8803dbca22dd9055fbdcc71196

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