Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e6a4cbdde7fe78…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 21:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 893efe27af5afc21c80271bcf6be7390 SHA-1: 6c11606a4da1acb976c1ba8f1cc81653b9d96b26 SHA-256: a5e6a4cbdde7fe784779609703a66a9807814002857ccdb75175acf586c96b88
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to compromised websites, including WordPress upload directories, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, directing users to various unknown URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4atslm6hh2n7u4enb9pfbhivmp/19973909121.pdf In PDF document text
    • http://clinical-pain.com/pds/userfiles/files/81631565596.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/17331064302.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/44934753826.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/padap.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/76616566610.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/srrfrnjmna4b577utke28ragv4/raranoxala.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613556B275745.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/revajelipe.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/guvitun.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/natinupozulimabumefa.pdfIn PDF document text
    • http://ustunongel.com/image/files/7473766734.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/javisibadaride.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210906094631.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/87207715974.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/buzuwejevubaposalirerapa.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf149fad3---16823699515.pdfIn PDF document text
    • https://subarini.ro/mm/file/26800977911.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/zokurilif.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/runuwatunoj.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/76230535848.pdfIn PDF document text
    • http://ebus.cn/up_file/file/98916834953.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/bimoketudajovalasida.pdfIn PDF document text
    • http://turnyras.lt/Files/file/kefuvobega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+video+chat+on+pcPDF 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_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 10440 bytes
SHA-256: 3b51c39abdf7192820bc75093400b1ffd5fff16198a026b50843ae1051ef0b4f
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 18392 bytes
SHA-256: 7a19b493cb536c074844e8007cd7fd69b7cedbdb94e7f9374a60b3df27c2581e
font_02_sfnt_off000131d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1