Malicious PDF — malware analysis report

Static analysis result for SHA-256 c587e26cbb0f91eb…

MALICIOUS

PDF

79.2 KB Created: 2021-09-27 12:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e96eb2c861198477f47908f1e9dcbdc2 SHA-1: fb00b7dc25d31699c766fd04500d9239494c4929 SHA-256: c587e26cbb0f91eb61fe47a47978d8551f33033a09db8776e33d8817419b8233
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://iccjsc.com/images/uploads/files/4415935093.pdf In PDF document text
    • https://behagi.eus/files/galeria/files/74896494084.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/pazejifadomuzosatavigosez.pdfIn PDF document text
    • http://identik.hu/editor_up/samoxu.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/25213538481.pdfIn PDF document text
    • https://renetravel.ro/images/files/73888185111.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7e578afdbff187c92d45e0e02aa52c0e/xogaxuferufukagotolaputu.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/79921638657.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/lodulidisugevonagot.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/mipaxavisimogara.pdfIn PDF document text
    • http://stylekd.ru/files/95174300991.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/kazirigibeja.pdfIn PDF document text
    • https://cncunse.com/d/files/jodisewom.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/govuzawa.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/65205249523.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/99871674490.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c41fff538567b1ba5f6dd10b663bf72a/wotebetumamadora.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/xoxonopuwe.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2f1b2a232c539500d6990377f906362e/femimizavotexotavana.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/tozojifivikezamewe.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210916_242EF264C342C3A3.pdfIn PDF document text
    • http://derivat.sk/files/kotuvejizifuzigekezafesaf.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/tevakarokujer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=app+anime+face+changerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E9 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_01_sfnt_off0000ca9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 20220 bytes
SHA-256: b9cbcd3d32846a3f009986727af6674f98e83ff338ec2cfdfda9b0277e4f0c1b
font_02_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001176f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176F 10476 bytes
SHA-256: 4afece163836712d2f92672b05f03d32332496f8b318b70290b623f5e95a7fe8

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