Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c40250689f8396…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 20:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9085d9330baa384fd2ba90ebdba248ce SHA-1: dec288efbdfeda172bee51ee12b5823fa8580c1d SHA-256: e9c40250689f839670b3e448e600fac2af667f69d3b57cde5dc68f01ddcad8c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=top+gun+maverick+movie+online PDF link annotation
    • http://chinahongji.com/d/files/72608240287.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2a9adbdb---64544338410.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/tezex.pdfIn PDF document text
    • http://i-dron.cz/data/file/38703444356.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/69547319965.pdfIn PDF document text
    • http://talesma.com/E/file/tujisemarulokeminedis.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suzuxiwifosudenuzawe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef82d5bbd---ganatejesawa.pdfIn PDF document text
    • http://acelybio.com/upload/files/falewip.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/musosazosibanofaletige.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/nigixejabusalofi.pdfIn PDF document text
    • http://soc-in.com/data/media/files/kasinen.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/roxobalakajeligusimafezof.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f300f40af921325d5704330f8e07d920/84611148036.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/newukenori.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134f15c2382a---27639314687.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/b4fc1iu9rrgco04pus9a1jhlkt/65968259897.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/tewajuzuxafakareke.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/ganev.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa1ff108d---13423046618.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/87932644856.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/pitag.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/ketuxebejapanazikawepe.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/dijox.pdfIn PDF document text
    • 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_off0000bbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BE 16936 bytes
SHA-256: bd3a5df156381a7b25ff90466e40a222955fa1234e5cc36d54b20c435dbe463e
font_02_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 10672 bytes
SHA-256: fd745f4cd257d95b4b9691451a6254bcc13ac2a55cc1f6dd703b737ae02a2a0e

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