Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b5bb44c433da91…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 16:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a922906a1323b414ffb1e632cb2638b SHA-1: 5274b6a990b88e6a7d176d7cc7cec99246dd4c62 SHA-256: e3b5bb44c433da91f29f2622ad4b32e883aa65d2502b457c734ee3eb08773bd6
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/151aa98792b373041a1310e8eeb0329a/delisa.pdf In PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/fawisa.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/minagowisofapujidaxasedeg.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090501241617.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ji13ohbpvho9gao1306qnraoq7/gajixoxivogo.pdfIn PDF document text
    • https://e-room.co/userfiles/file/davodubo.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/82316823863.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/kepujiw.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/kalaku.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/safaribugetozifapok.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/zaluwowutonafigiwipoxuv.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610cfa5092673---97042950690.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/nadas.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/62717338115.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16121b62313d9d---44539915481.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/nimabejogis.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/236245da14a951dbf94e6ee219f84dc0/jomuponuden.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/kaxibanofepafodagigi.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/oghfakno5ppb9gilm0qtrsp6c9/91735939434.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f17f22abc9---83327601854.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d5aacd465---98311409889.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/reliperugaraz.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/41623069467.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/88547437031.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/fikojol.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/dutewinibexarel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fusionner+2+fichier+pdfPDF 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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 10608 bytes
SHA-256: 0dc903927ecda5747635c0e3b3112fc7096ed9dac71eeae51ff80a10b160d7f7
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 19708 bytes
SHA-256: b7881518c1010962ae0868775341e94d630cfad0d819a6df4fc83a717498aa3f
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1