Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c06d8a8abeb6afe…

MALICIOUS

PDF

84.3 KB Created: 2021-07-26 10:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec4bc172a351185fb32402385d8bcd44 SHA-1: a78cc520c9139701d082a859c4ff3535000a0087 SHA-256: 4c06d8a8abeb6afe4fbd5bcf056716d15ede7ad4b2081a51885890b7c4b6b2f1
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload storage. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install a remote support tool, a common tactic for phishing or gaining unauthorized access. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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 http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160783521b3ed1---45561331993.pdf In PDF document text
    • https://binhvi.com/upload/files/49510711154.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/72338548671.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/rodewav.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/fa46d745f66d96f59b2b54060c60e239/durofodavijojijajawegoma.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9fbde80606cedddfe43676843bd7abb0/golivepuk.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/37010947888.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2da882291bc7b370ea4c697606fe95d0/32571129979.pdfIn PDF document text
    • http://short-story.ru/upload/file/sijig.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/e0d7232ad23808d517613eeeb2b29b63/86705612050.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/vaziduwumadudamusuf.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/30905009995.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aecd3e10c7---68703519078.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/lizunurujerebedozala.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/sr901nn72rk0o5tiurbec5qjn0/tewilosiguromasodekifipop.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/nelokar.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096aec23be3f---wedimur.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4880db8b7e347e3ccb15847635e25907/73849145417.pdfIn PDF document text
    • http://demkapi.com/resimler/files/55409537088.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607232eb9dde7---nuxaluzawud.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/fuzoralekakozakaw.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160849c1f0990d---tumerolibufiw.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e7a9aa4e2---19377897799.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/598b7d880d3b737528e0e92c0c829e07/benojadem.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff6cb57a264230171e1a3b3841bc7b73/kirasixa.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a54a46acb38---ginoneto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fahrenheit+to+celsius+conversion+chart+printablePDF 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_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 17456 bytes
SHA-256: d516c5752592cf39da5c10fa14cb625948ef72eae6f712eab535deb365419d2b
font_01_sfnt_off00011253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11253 10756 bytes
SHA-256: 4763252b92b3f258e19ffe90448f3c6dc77c83e1ff990d694ab3583c72ebf5f4
font_02_sfnt_off00012aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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