Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead1111c7df169dc…

MALICIOUS

PDF

97.3 KB Created: 2021-09-01 00:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b10fa7c6b297a131b059cc032f171e3e SHA-1: d729d1833f449f00c4db8f922a4c51aa22c7ae07 SHA-256: ead1111c7df169dc1ec340979a90f84724c2a2c3ef26405c4d30541dfb5f5068
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://emurus.jp/userfiles/file/jalogode.pdf
    • https://turismo-galicia.es/ckfinder/userfiles/files/kedop.pdf
    • http://iworking.vn/uploads/files/71719868291.pdf
    • http://xn--e42bt3l.net/upfile/files/72483525945.pdf
    • http://bpabv.nl/uploadfiles/file/72034679961.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/jipowu.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2541fdbb---torulabosapifowuguxof.pdf
    • http://brkvinc.com/userfiles/file/japonowevelenebevesudi.pdf
    • https://angkagenap.com/contents//files/sijilobuzunewaj.pdf
    • https://baxsporthorses.com/userfiles/file/tapomakejo.pdf
    • http://delve-cr.com/uploads/98105753538.pdf
    • http://cfacgroup.com/uploads/FCK_files/file/95778804396.pdf
    • http://auroraenergyproject.it/userfiles/files/24938829016.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/pajefapalomejijupi.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/d1d152d27e6c119eca951fe417b10b77/48518811604.pdf
    • http://drapa-technika.cz/UserFiles/File/70099178573.pdf
    • http://trustarshida.co/cache/fck_files/file/22339004402.pdf
    • http://pekingtogo.com/uploads/files/devazadipodeb.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa06771a77---kuturiga.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b4ced32a08569c99b5489373c25dce91/gupuj.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/20372654234.pdf
    • http://www.sas.edu.mn/ckfinder/userfiles/files/vebusijezexagusarukigij.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8b828e542---rufuw.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2879a2320---7219190637.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+frost+chassis
    • 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_off000114eb.bin
b323c07ac8c3e20117d3e3b9886dd6ab7d50f14a8cf8efae2fcad89f415b90c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 10540 bytes
font_01_sfnt_off00012d2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 16792 bytes
font_02_sfnt_off0001453c.bin
935f5b5a6b02c409746227e93379a3159b127ad5751692822f0cd71c1f0df5f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1453C 19224 bytes