Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7c74d48017fd78…

MALICIOUS

PDF

96.3 KB Created: 2021-08-09 07:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 69123c0e77babb77c8986be8d0e46222 SHA-1: 1543a67dc1387e5f7a5f01e70185b41640d75bc0 SHA-256: 5a7c74d48017fd788fb38b8b569307b91ebecc79a6d8f432d83dbffa2a79c504
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The presence of these links indicates a phishing or redirection attack, likely to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://studiopignotti.it/userfiles/files/mojujigoxubi.pdf In PDF document text
    • https://growyourmoney.in/userfiles/files/lotelalusevibosixelewod.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ra9ba59bplvvmasbbjq1bgkr2g/gutoxeg.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3c9554b5---98477821704.pdfIn PDF document text
    • http://1carl.com/userfiles/file/66200375792.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/8911847278.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/matomaxepadumakuxebogeve.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/xemawagodafabovobef.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/paluzazebadedalisujizaja.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/28873917787.pdfIn PDF document text
    • https://clove7.com/userfiles/file/dopot.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/wujurexatofikexosoza.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/4330402752.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab72df2dc0f---nenijuz.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/sogizemirikizaguraroba.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/513fa24fa7524562afe6bf77e1947ed2/jilujigimaz.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01805ab8b---32942986285.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff811204fc---90322576838.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b3497da76---fezejaligajesevonef.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9c0a8dda2---pubojaginopam.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/38277283564.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/15774066361.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f776b52e---95076963348.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2a77c62326ff9dffec934bec90e314fc/lezus.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/xubukumanivuparodanusotag.pdfIn PDF document text
    • https://testbankuniv.eu/Fundamentals-of-Corporate-Finance-9th-Edition-Brealey-SolutioIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fundamentals+of+corporate+finance+solutions+manual+pdf+brealeyPDF 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_off000110d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E3 17788 bytes
SHA-256: 8e0d05bb64d92450fe5a0b47ac4006a3d2314d03c9ce5be684a6c83960ba4505
font_02_sfnt_off000157da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DA 11112 bytes
SHA-256: 7d5fa4bde43bbd690dc3c459ea361c8d62b7c445487e747cd60521b34dc16bad