Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ddbf33ce8381d5…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 06:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b1de9febf9d0505c03294db16dbfd2a SHA-1: c9f03d5bb13a9d34e3ab2933bef1142c4847c175 SHA-256: 37ddbf33ce8381d5bef7de49e80b58a6e57a7e62818b8281269c25ab6074f40c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm intended to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://thepnguyentran.vn/media/ftp/file/konubozewuvewilafokadu.pdf In PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aae3d281fd2---31421329380.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ace558c8816192cbdfdf42765478d999/12580447838.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/39682004507.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee4072c3d---74854646244.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bac5df4775b---garararupiz.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/860e96b1122f9e678e55c1fe1fa088f2/bifutewokezekodasipowapin.pdfIn PDF document text
    • https://mmszke.hu/files/file/bofebegufopilinefuwez.pdfIn PDF document text
    • http://nfc.soo.jp/file/mexijesumazud.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/cdde629131c2e4521d5b280a3a2e383d/niwexefevisutedipepebixef.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/zugovibetuzuxeseselawes.pdfIn PDF document text
    • https://salonrewards.ca/images/file/39975084567.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/xetudafimaxogipepedi.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/xipujifiluvasiwu.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/3879467854.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa211b69db6---55645706325.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/9d5f11428be9f3301b49d90f08e9625e/45947215186.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/99176489557.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mdf4jqqlrcgv9kemo0bt8js33n/jidamora.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/8a99048bf251221c27edbdc46d5b4748/zimivuvanev.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/nisuzafo.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/6680236268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=chordate+embryology+book+pdfPDF 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_off0000c12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12D 17924 bytes
SHA-256: a30feae4e761dcf89b6030e4c5c59d698a2558fffe93da8e7cd3379998181ef0
font_01_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 10960 bytes
SHA-256: d2758cd5f51b7d064c74dc42eb37c44163d30c00bccc776c0502e3baf6898d7b
font_02_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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