Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50e10f94b41c9e8…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 20:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 146044a2a6e0cd0300474c4243214011 SHA-1: 82b39a96f60c993ca2aeae591849c02a46762838 SHA-256: f50e10f94b41c9e86c861a705ec280f2ac90e255c12c063f1124cbd81b075519
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 compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://webcertain.ca/contentupload/fckeditorUploads/organization_/file/97769976947.pdf In PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/2d9dadb5686f53e8284d59850b7e3c3d/jalefulojafakev.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/9419291992.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/42554688288.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416823bf2d7---65912778938.pdfIn PDF document text
    • https://ikima.fr/uploads/file/weremites.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/19899552077.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/81288251641.pdfIn PDF document text
    • https://ebooksweb.net/files/file/72623723674.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce8e4d2464---nawapeben.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148759fe9e73---menalave.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/23546707012.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/vezemirewoliloredifalagid.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/gumulipew.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/47440888532.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/34165635166.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/zavuxusamorekaxatezexufa.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109111148545388.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/mawidadu.pdfIn PDF document text
    • http://nensi.si/upload/file/59979940784.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a3b46c9403aec17913a0224a131b3769/jeloxejogofufepukazogelij.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/96546209911.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/816df9322dee64c3215b94ec65599059/wazososekope.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/zugijepajimebajezegeb.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf256b636---94498977058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=msub+movie+apkPDF 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_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 10456 bytes
SHA-256: 1cf75c7c65f3c5e3af07d980c9b3ed8ae94339c40fac56c11035bc34cda39921
font_01_sfnt_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 15752 bytes
SHA-256: b60a09afcdce0e5c9d37c08083f8905fbcfded0521e941fad235c881c71d7292
font_02_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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