Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd32fb96be65fbb6…

MALICIOUS

PDF

69.2 KB Created: 2021-09-15 17:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9810eeece942fb80d10767a328bf85a3 SHA-1: 68e5c76b6c9024515dab3affccec27ef5a44a547 SHA-256: bd32fb96be65fbb6f419dc3ff59805d84294e388555a47cc710d79e49efb5e1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to attract search engine traffic, and the presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests these links lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=download+mk11+for+android PDF link annotation
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/pigigabizubavozilon.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/49768973649.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/90409843705.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/54050816453.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb6c4a491---gokal.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05117a99f---51502728309.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/2069216372.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/8741728844.pdfIn PDF document text
    • http://domuran.pl/files/file/1341314342.pdfIn PDF document text
    • http://rld-carbon.com/file/netijaxixizib.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/79604714209.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/42485746986.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/pakod.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/danuwibagosuvube.pdfIn PDF document text
    • http://healthywithhart.com/res/file/sifevepoxokasesexago.pdfIn PDF document text
    • http://vce34.ru/attachments/file/32363768443.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/geribixudekazuzu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161402c412a329---78765207496.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/rovonimaxomuxawo.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109112347213778.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///pamanevijumadibaziwovo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d78a5d284---67828796253.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/32075261709.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/4490757748.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/91011067014.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_off0000b0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DC 10348 bytes
SHA-256: 05d0423aa58923d42f4c6ac0d79c37ab81a845c3df8f655c12c37a13d1c16658
font_01_sfnt_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 15444 bytes
SHA-256: 06adf6eb65517d6a8d9915f7cc67498ff77bde99baea4f27849c10f1878bec51
font_02_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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