Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a9e915784dfcd5…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 19:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eef974c2e76a3f3962a3fe9a5dc175f0 SHA-1: 5fbdbfea4c4b8ed0634b800bcb04b24e67130c66 SHA-256: b1a9e915784dfcd5c953111816cad65c3566cc9d07108b93d4f7a0db4347640d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=days+of+the+week+in+sign+language PDF link annotation
    • http://jpiano.net/userData/ebizro_board/file/wibiraveraninu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ffd4a69e5---bejesezogido.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59702260039.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904140404602.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/88565035900.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/73861546393.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/le8pti5en8s85rpr6oodh98al4/xavekipamatiwupikalaku.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/78196539901.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/94495065998.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/sotebegile.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136372cb310d---48267688578.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/31507384310.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/36175713048.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/dawuwuvivo.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tawerumajojum.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/qktedo22th24ff8aopb4s5pcql/55011060185.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/63103019552.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/36829334718.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/moon3atg10vc55ck4l5ovr3vnh/lulenesov.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/retusibisisulutarusuzerol.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/29663ecc23859b96ac67c158834b5920/5943178955.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/79529029565.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/57097434725.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_off0000b0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D5 14808 bytes
SHA-256: 809a7a059054c88dce4bbf0d915325e5ea0560363db4091fcb3be4b3b4c67815
font_01_sfnt_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 10788 bytes
SHA-256: b5fbf2a2cb44c79b2a3f2adc0125c32dc00b2ebbb7d98458374ca8ceeb424750
font_02_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1