Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a35d6c082131be7…

MALICIOUS

PDF

72.5 KB Created: 2021-09-30 13:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c39477a5f61de833e3a6a780fe100a4 SHA-1: 23c719336e66e3f8c0d0b4a3c33359657fb1aa06 SHA-256: 1a35d6c082131be7be01ebd899211d671e8bb7ebadafd9ef9e01841a1ca8ff0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://isagrinio.gr/userfiles/zowurubudoxitageguke.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/gegerevudoniv.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/57240260291.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/gonodogakexuzusufeni.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5a80b533---83705430210.pdfIn PDF document text
    • https://gilbertems.com/videos/file/75161134115.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/q38iogchj5e6o8crt3dmls5kl1/49029545715.pdfIn PDF document text
    • http://e-sportis.com/images/upload/80661613231.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/xawiwifubakenaxebowabako.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/33978452209.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/66362396708.pdfIn PDF document text
    • https://unitjaya.com/contents/files/58240647467.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/e7837f12b55e66836e23c774f342129d/pexajulibixif.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/valapi.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/92132073291.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/80608da26ef40e4e5a0998907b472d09/86079390079.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/xorivifiwebesarimurubi.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/bilimefadatub.pdfIn PDF document text
    • http://topas.lt/userfiles/file/16796039419.pdfIn PDF document text
    • https://soechi.id/userfiles/file/32917157037.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/xeluwer.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/buwix.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161366201a8966---dewezasibadugezokavubiwej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=influence+the+psychology+of+persuasion+book+pdfPDF 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_off0000b20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20F 11296 bytes
SHA-256: e7a169f618b0a0d14bfce5dc501ff3f9b4688e86385dd1696dfcb135535bac27
font_01_sfnt_off0000cc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 17980 bytes
SHA-256: a3306dcf6877f1019c088cbadea9d1890650e9417a54382867633cd3be232e2b
font_02_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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