Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abb30f2fce7d23d…

MALICIOUS

PDF

185.3 KB Created: 2021-09-01 16:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e519f1724db7549658cd4e6f73ccfc5c SHA-1: 54a980bb841689d498b8ebb7b77fb88282c1df35 SHA-256: 8abb30f2fce7d23d1c673695f6da00e3c3bac3ddef2b18711194138969204f9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. No scripts were extracted, but the presence of external links and the high detection scores indicate a clear intent to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=digital+signals+and+systems PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21de5247d---gelikemajotesinuzopalak.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f597bd932---pabeguguxi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/aec25e3ea2f5cd887eeff9c177dae2b3/pipibedojatupusumofanomaz.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/821804aa0a1fa2b3842cf020b6b42e8e/tunakidabovuxuduromukutu.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/43642135045.pdfIn PDF document text
    • https://moolans.com/uploads/files/vijavagatenu.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/94453342588.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc0fe8fd0---divujowuvoratuverike.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3dc9f7ec0fc7eab67e2cfdaa936b614d/26375939569.pdfIn PDF document text
    • http://simonide.org/userfiles/file/nexojosulegusuzikat.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160708eb173cfe---doxukadafavojedoju.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/80285968331.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/00a2ad808bfdfdca71fdf106f1fabf35/tuforozisirebudugufenek.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adf900b4936---57089493569.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/56388742106.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/48e4ff5340ca0d04446925b74b7406fa/74206691608.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080c34135bbc---nademejexu.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/zotor.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/defdd758de1d8fb60c3789880c86495e/67248435507.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/96450655598.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/34728977812.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/losixukawol.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc4f64edf7c---nifivubaxabovovozebaxote.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/6335835971.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/19401777556.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_off0002716c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2716C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00028983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28983 10488 bytes
SHA-256: 7987f4fa33916045bac3a26073c4d14c98fe81bb9760fb56da4d9ae352114f10
font_02_sfnt_off0002a122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A122 20188 bytes
SHA-256: 296a83b80d6a663155b1e00486b3a6861967b57b3e227ab20c46aacd43ace9a2

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