Malicious PDF — malware analysis report

Static analysis result for SHA-256 2227239d91fb86c7…

MALICIOUS

PDF

94.6 KB Created: 2021-08-08 14:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 40d3ba94b60d5af3a501f7e664945a42 SHA-1: 4d534cc796255e9fe4cff89104f12503e1c5dcff SHA-256: 2227239d91fb86c7a445478c7d6dad898349c3e2e8629962ec694e0ec9919c48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=airline+flight+attendant+uniforms+for+sale PDF link annotation
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09eb2ad9b---94345490535.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/roponekorogideja.pdfIn PDF document text
    • http://beateromer.com/bilder/file/82631536302.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/kojija.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/29488674841.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/karirolovutapeno.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/zuzudibafikase.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16102f88d8332a---70851378684.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/mepufepebuxamikaf.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/fd72ea9c2d1c2b1a34cecc98ed3f4981/63495534040.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/mitut.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2c83d411---newejon.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/tumusolusulasivaf.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/82326991362.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/xadidikinumonubuf.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/33442778131.pdfIn PDF document text
    • https://suksesunited.com/contents//files/28600098384.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7fkatode0g1ur0verghpnfsv34/mumazo.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/wimijagagonifikedutewebo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ad998f34d660ad740601ff9267de8f24/nosipupejox.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/35484012070.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f9806e101da321cdcca6133aabd8452f/7289985197.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/64064765177.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_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 10884 bytes
SHA-256: 9e5a5704141f0dd2b84a8d54c4df8df21e7a40d05447b0a5faed296eedf3a6fa
font_01_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 17200 bytes
SHA-256: 9d73f609d2c293976a109d96b0ad8439ef58c610b2ba2531e0cea616bf15a54c
font_02_sfnt_off0001533c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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