Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac5e60d9ff4b2aa…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 00:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2afe16840107b4fc9d30d0b07bb3ecc1 SHA-1: bba2e3f4946d5d83bf0fab73e93a3670d1e46d72 SHA-256: 8ac5e60d9ff4b2aaeb940c69955a40ffc4fffe669fae2a709726dcede939ba06
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://phatgiaolongan.com/upload/ckupload/files/bibotusobidiz.pdf In PDF document text
    • http://artkulinaria.pl/sites/default/files/file/59381130941.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9113c84e2---56141807550.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/659b2fc1a10f1cd8e84af0aa30f87eb9/juxitobikuzaxomiku.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/fididifotofevabutekow.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d48eaa9bb---12311775341.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/juperetanegefivona.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/lapojulesarofowu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094094b76531---dibowifesubutegujukoxetod.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b43e602d65842c0e47058e3cef69405d/7442745869.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/suxegokogemufamosenebefab.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c950bc80b16---merodinidobeveminifame.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/pewisonodevugutomotab.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/potevumaxa.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2f7d8966dad4bccb1e66a3ba043ab574/99022711432.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/41430089699.pdfIn PDF document text
    • http://ducnhua.com/upload/files/48717978644.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752995167e0---41295669747.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcf7dace3a---sogugop.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/20520702963.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/xabadorilumadokijafedotis.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c8ab2769a3---99741469449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=review+of+related+literature+about+organic+farming+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_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 11232 bytes
SHA-256: d6541a2e5842fb821ada5cb09009aa94762919de6e0ab0b456b52ebf106ae789
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 17476 bytes
SHA-256: fa7fbb1ff0cecda978184f0e4efc21d8daa02a99ba6c8cbeb559a1ce7ab55089
font_02_sfnt_off00013139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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