Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22ab4910efed2f6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 16:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15f139187008ee2216a538fe50d14e20 SHA-1: 689b80e9b5de256fb77ba593789877cd44dee594 SHA-256: c22ab4910efed2f658717c72a8b53f18ae75e259a277eb305f02b79ccee1acfc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the 'SE_QR_LURE' heuristic indicate the document likely directs users to external malicious sites, potentially for credential harvesting or further payload delivery.

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://vietcem.vn/public/default/ckeditor/files/35977119867.pdf In PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/vuvapotadusarozejobokinuz.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/71383469959.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/g1kq3vgcjsqdnp259tmcfhl1d3/ragofure.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/legudaxir.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/37984193760.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/genufiv.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/30137949212.pdfIn PDF document text
    • http://sciattella.net/images/file/mixofapiwuwixufugu.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/gutapuromevupasafizo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ad2196fa---93009610617.pdfIn PDF document text
    • http://aa-nusd.jp/kazijaziwomad.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed95a0cdf---75435031503.pdfIn PDF document text
    • http://hk-keber.de/images/file/vuvilawuxoguz.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090701494494411.pdfIn PDF document text
    • https://ghnservizi.com/file/54023012400.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/57410876228.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/jabuvoferabo.pdfIn PDF document text
    • http://blgjad.com/upload/files/74499850704.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/janilafopexeberuvaz.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/gobiranotinebolim.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/xenibomesulu.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905041153295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+download+qr+code+on+androidPDF 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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 10416 bytes
SHA-256: 3406fdd405a95676c380ab0be8d0803cc6aae26c8b102fb6f2cf749d657682ea
font_02_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 18592 bytes
SHA-256: 0a8a4d175dd0c56445ebe665634bb88488048a618e8e27f26d4a0c32900924aa

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