Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d6402deb379ec7…

MALICIOUS

PDF

85.6 KB Created: 2021-07-17 13:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1bdd9e16e686ea90ad596fe2926bf7e SHA-1: abd33dea6834171e22c54deeec14bb46b8b1534c SHA-256: e4d6402deb379ec7756ad17d0ea75121b6f11206242d8d054bc54f5398275138
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36d9ca0878---90155378678.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9b2c92022---15079859505.pdf
    • http://dgjst.com/upfile/file/22874868965.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b921f1a95---lufoguxazilejavo.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/voravoxorugemezobi.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437c485f61---39990254521.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0da3f260---18252659981.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a182265a6ac---1302337857.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d2eb535c---kegapixere.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bd5fc94ff---befofatuvevotixofekokesuf.pdf
    • http://tort-art.ru/userfiles/file/32968040372.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c86d4e80e---26175776127.pdf
    • https://worldmedglobal.com/userfiles/files/bifepatimewonepam.pdf
    • http://branpc.in/ckfinder/userfiles/files/poxutavovafabubujen.pdf
    • http://kraski-chernila.ru/resources/file/21297658462.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/rrgno3m3e6jpjd2j639mdc1q36/60068667597.pdf
    • http://accessiblevehicleservices.com/userfiles/file/80101663398.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/56bc1a3b313d52a737c83323570025e5/komekaranavip.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608782c755a76---59492718499.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ccafe6cea35ba30f9b3969df5f070081/pudifogexelat.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/oh1g55de9195984p048l1f7js2/gobitulokob.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d09a055c0bc514e9f588e9b44fbec68f/38269236752.pdf
    • http://adbuilder.at/ckfinder/userfiles/files/33663880961.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e402e1c74d54c4dfec145765e5b36071/mulaxafewezonabozomas.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba277d8fa---bavikusana.pdf
    • https://anakaygame.com/calisma2/files/uploads/nazowifigebexikulurisirod.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210703_7048E6B59FA837DF.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=drawing+old+buildings
    • 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_off0000ebae.bin
0507f93447c99c99404883350d49045c3ff506d6cc21d379937ea1631aad41ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 10520 bytes
font_01_sfnt_off0001037b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 16792 bytes
font_02_sfnt_off00011b8d.bin
4f32ea910692a5c09245e1475f85e45f66e8ffc014be4a8e666d0bc77a869990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 17308 bytes

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