Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebe4595d1760db6…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 19:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a76296941bc9b4c8be127901e9fd4b80 SHA-1: 6c68cffb5b31107797b5c516a112ee5db15284d4 SHA-256: 1ebe4595d1760db6a552240dfeadbca6610cde80be023f9b14bf86287484aede
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable hosting sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://huntic.ru/uplcv?utm_term=redmi+note+2+android+10
    • http://peter-scherer.de/userfiles/file/65503953611.pdf
    • http://www.tobywells.org/media/fckdir/file/jumudililaza.pdf
    • http://mikllc.mn/uploads/files/73462134205.pdf
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/95232700045.pdf
    • http://pro-group.ru/userfiles/files/87279904478.pdf
    • https://tigapilar.com/upload/files/37767127247.pdf
    • http://ndc-group.ru/uploads/files/topegixuwogazu.pdf
    • https://tapuionoticias.com/ckfinder/files/46608904178.pdf
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/13127066934.pdf
    • http://z-sinpro.com/upload/files/1143951695.pdf
    • http://yugreat.com/filespath/files/20210926234906.pdf
    • http://www.radio-kum.si/data/files/14138877861.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f45ec416f5---zedufemoxekajejotejoxago.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/25646843317.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cac211c71b---7964831596.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fee9c29244---3346701197.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///52932564691.pdf
    • http://theseadiaries.com/ckfinder/userfiles/files/boseta.pdf
    • http://architettotoma.it/userfiles/files/nitowozeliganimorozuvugiw.pdf
    • http://imosa.asia/uploads/files/202109031149005196.pdf
    • http://industra.sk/userfiles/file/koragugukobuziri.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/54856834107.pdf
    • https://armenia4d.com/contents/files/5198848105.pdf
    • http://railwaysrailroads.com/upload_files/files/rebivafosomuvuziduwel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aea9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA9 16792 bytes
font_01_sfnt_off0000c6c0.bin
566ffc292e13d252dfd3abb11a4c4523eb81f02e4e07f29b2b0a2292aa859d87
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 10532 bytes
font_02_sfnt_off0000deca.bin
5e08ba719d5fa34ff28693223227c95444e0d34594570f86e09ebb0aa1f57725
pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 14664 bytes