Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5799aac0415a82…

MALICIOUS

PDF

73.3 KB Created: 2021-10-01 02:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9cd8a75da1e5800118a8ded81ea270d9 SHA-1: 996a10d4e70cc5282ca3413bbda47621dc24fd22 SHA-256: fd5799aac0415a82283d99614515518761a52170d181930ac0bf0b7455973f1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=super+sidekicks+neo+geo+rom PDF link annotation
    • http://chinhsuasolieu.com/media/files/dedikorafojab.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405e9844955---lefexovonituwivubewobuv.pdfIn PDF document text
    • https://akconta.com/uploads/files/31686525398.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/47604682613.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/13400688098.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/toxinajosevuzevotenifuri.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/41074276226.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/edb0d565ae3596c3e618651d1a877304/37374895063.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/56d907f72d9d93974a3d40548d026f7d/zulejitatun.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/lugifuse.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/pakogarunedol.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/sonujevob.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/takujakudi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136475901413---92780179503.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/33829232325.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/33992506155.pdfIn PDF document text
    • https://btegypt.com/file/2199068870.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/32322908248.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/lovusotatogofikanixes.pdfIn PDF document text
    • https://remini.hu/userfiles/file/xelavabapobagox.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/pakosozawoxoninurolewi.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/belutodar.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/77858628437.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/dogupu.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_off0000baa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA4 10820 bytes
SHA-256: 9c38e3bbce65bec4c3f59e8ce6f00fb6904e6228705cad6bebff03be5cf8f1a7
font_01_sfnt_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 17388 bytes
SHA-256: 9ade21c95662929838efdb774137fffd6dd74aa11cc2ad4546c033cd28f2630e
font_02_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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