Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5323398c59d496…

MALICIOUS

PDF

95.4 KB Created: 2021-09-10 14:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f971664b9c516e7711480348cdbc2f12 SHA-1: f949d671d3b3486a08b2d1eae319b4d18b873e7f SHA-256: 1b5323398c59d4961b115d62dd53b7efe68697e3c084582fe86ecf74b9fec49b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://hifitness.hu/userfiles/file/wozor.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/xejodusatisinawebox.pdf
    • https://bunyaminerdemir.com/resimler/files/10661504034.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/bujorowitegi.pdf
    • http://mazraeir.com/images/upload/files/15643263729.pdf
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/29258496600.pdf
    • http://lube-stc.com/ckfinder/userfiles/files/raletidep.pdf
    • https://vpmemorial.net/images/file/jijavekejepiwafawisiwiwiw.pdf
    • http://esebtekstil.com/resimler/files/86985862508.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/279404b210f5a2852b978b1834aa2076/46973685589.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b237e123b6---madavetovinoxiruvu.pdf
    • https://fotoprint.lv/downloads/file/96570340275.pdf
    • http://feynburg-uhren.de/uploads/11373381916.pdf
    • http://www.poliklinika-hb.cz/userfiles/file/3282132183.pdf
    • http://codienlanhminhquang.com/upload/files/tugoxigimigemanotaxulude.pdf
    • https://mgs-on-track.com/uploads/misc/files/vilutinizukoditepuge.pdf
    • http://ngocphuocjsc.com/public/default/ckeditor/files/pefetasuromonipof.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3903083c---dakapun.pdf
    • http://xinxinhouseware.com/uploadfile/files/4580199788.pdf
    • https://anukulagrotech.com/userfiles/file/80675228645.pdf
    • http://contactfm.be/userfiles/files/guzaluxogemiravozilepilad.pdf
    • https://sadhankendra.org/erc/media/risaxam.pdf
    • http://gtlfuelmarine.com/userfiles/file/seperanaf.pdf
    • http://fcraregistration.com/UploadedData/file/toxotonifetofav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=my+talking+tom+gold
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d5c.bin
4da4ced8b742f67b6db2287cb4777354b48daf0d0b8f2d2858a228730e397e2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 20076 bytes
font_01_sfnt_off00014165.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14165 16792 bytes
font_02_sfnt_off0001597c.bin
0e3914c092f72331601186bfdd569c40e0765bcaac681679c3d3b86a9490081e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1597C 10392 bytes