Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abeb6bade138d5b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 21:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8178f97155b02c0904690ebd01863f2 SHA-1: 6583f580ac184159339ef57b68e8ef71edb8c869 SHA-256: 2abeb6bade138d5b2fd11bcc040fce23b296bc1ff52e6a7cf0d5b39c7b05f53d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, several of which are flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. The presence of a link farm on compromised CMS upload storage suggests an attempt to obscure the true destination and leverage legitimate-looking infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://associatedreclaimed.com/userfiles/files/gimupej.pdf In PDF document text
    • http://jinshi66.com/uploadfiles/files/wukorenikawasexevaxupo.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/sokibalinajodetag.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/jitodikilisokedadu.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/3519427657.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ihfbvdn7irn3b30hdcddnfdtp0/puzibotifufiguru.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/jesuzatumawanelotovivarix.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/77837750944.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/xotawupusifokowepaja.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/36547373168.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/vanawomuwilag.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///fedejifivaneru.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16142877639b1f---sawig.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/ralurogiwasavize.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/towujaredi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/muvavepu.pdfIn PDF document text
    • http://cl-pub.com/files/files/89399311888.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1aaf84db6---71666973147.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mulilaxarubo.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/kagirokijewutomoranaj.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161304d31861d7---87033505483.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/remirifejubasasafuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fut+20+apk+modPDF 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_off0000c981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC981 20136 bytes
SHA-256: b1474c0ce640c10b122fb0077e8eb6fa810a14190abff618573b9e71683d63c8
font_01_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 10320 bytes
SHA-256: 08e49d2cb84565837c3397c363c74c55b6897e3e7ac37eb8d36af915868e11ab