Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a88cf4e1bff16ba…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 08:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3067ea97931f7c019e2d7b2273a01f7 SHA-1: 4abc163a59b612f81f5577ef72d08f89b8508600 SHA-256: 2a88cf4e1bff16ba856622f18a2cd3aee2253e66f8c3a7f517d1d91a7998eb92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of multiple links on disposable hosting and compromised WordPress sites indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://inse.us/uploads/images//files/rizusitazek.pdf In PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/cdbe7334786471cd38a7ef3566be8541/zowelimexisigi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe2d6727b---betavesolegoveto.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/zebakozebi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/s0tao3n9pji8b8gnn3lriqq0o0/79398023885.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/dinukoxo.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210714/file/56887555098.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/34836214588.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/jibovuwazexemosaratum.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/37013963483.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/58495477680.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/j8u6gliemrsd87tsslfupcgr35/51809467789.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/40926872720.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/5efb13a7410d74194e4291a27384de2b/bixekotadiwun.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/1b52cad59af357e89aab10a859c2dc02/31459676427.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/kuwikupelanaziwanejuj.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/jujet.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/nomivipojoluse.pdfIn PDF document text
    • http://emyorganizasyon.com/emy/ckfinder/userfiles/files/80936677425.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/wilujiki.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/17361365972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=solar+system+worksheets+4th+grade+freePDF 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_off0000b70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70A 16348 bytes
SHA-256: 3264fbe4c6874dbaafe376e4f1c114ee05e787a682c11901cb03602d345e9e79
font_01_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 11048 bytes
SHA-256: 2b715f09a3145f42eda8d455455000af37f2bbff33863406d9fdb50afc249fe3

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