Malicious PDF — malware analysis report

Static analysis result for SHA-256 55562d4e697b360f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 15:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b18c0565fbb6c3bac0f7533d3ee8b739 SHA-1: b070616e176270ab4481c1e62a835c6362860904 SHA-256: 55562d4e697b360f2a701f2b75503eba74f6cafc3fe11a92bc8f72ac01514f03
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=mortal+kombat+mod+unlimited+money PDF link annotation
    • http://duepassidalcentro.it/userfiles/files/89262474278.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/07/66558913614.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/81121298264.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/95437350645.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/vemilekexiwerubizoji.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/33754380116.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/65667244185.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/47014774915.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/5418106554.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/7cc875aef7a72008142debdeafb47b15/81042703573.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/30761493971.pdfIn PDF document text
    • https://adikkedua.com/contents/files/donizipabovogutajuxoxa.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/tubolenuxubofaxoze.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e83ecbdb8---puriguruludakaronaxijonox.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138aff752ecc---perepanelotakubemexosari.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/dapaxe.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2d3d6bf9---mikoxugexevedakejudaz.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9367e106f---nimarujojiradaxed.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/wevalakofejetomezamutuno.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/zomofaxuwe.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613c2a0d1fcf5.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/revemulaxekixuligafaw.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/20991223897.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/wetazaja.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_off0000c598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC598 10680 bytes
SHA-256: d666c92a98aa3fe1a45139d6ea2593b5b9c24c74823c58eeb758a98f0ee9b2c5
font_01_sfnt_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 17092 bytes
SHA-256: dbde628ad7cb72063866917432c6c48a2e3f984cb62a790c30ed29e158d26e26

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