Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17343938dd67bf6…

MALICIOUS

PDF

86.0 KB Created: 2021-08-23 18:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ca37a8496137eb4176cd5d22489ffdb4 SHA-1: 0a4c78fe9b15384a6034ddcf9b9b0ec58fb02f2f SHA-256: c17343938dd67bf654f477c5959448eda42b04924735f176e338078711472dda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.ih-consultant.com/ckfinder/userfiles/files/wovevaxorubetu.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/80fe208b68b83fcee34425d1d248da26/pijoler.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/kt7p2q4kdpl7tv46tq1v31a0oe/6830578778.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/91063298515.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/cfs5lfmm400bluhf2shmre3o7b/zozisusuwifisibeziwu.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/94297147278.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/tiwukawo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b75b03947ae65f7e30e0852b5623df01/pifulotowusu.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/19327964352.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/1k036ubp3l96mc1kvuukde0v72/jurunapexexuw.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4397140dbbc7b6c7ea37558f5caaff75/wajip.pdfIn PDF document text
    • https://777mto.com/contents//files/64571091928.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e2139a105---52293554306.pdfIn PDF document text
    • http://bestcareloan.com/ckupload/files/60177292890.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/5d9d086aa650cbdbdcac1643b2326996/73124035626.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/78678999596.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/8cmkb1cndk9mupamm5deed4u17/gokuluxana.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/91bd6ffa67878c371e39966fadfa89e5/5928779162.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/83539963495.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/cd172069cbdf67c3b8b1742a150d6fd7/toxeganoxokekap.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1a1b506f89bd31ac431acbc10c21f083/tolil.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9d564c5c2cff8865c3fdabfc42085a70/17321170124.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/murafojubobulazudirewirax.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/xuxelenotusow.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb909c3887---68362828505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=one+direction+book+pdf+free+downloadPDF 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_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 19540 bytes
SHA-256: 4ced07dfd23adae8ffb2fa06916a7d85d57464fae528777f46185bc45996f60e
font_01_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 10788 bytes
SHA-256: f9d24de6a67e185be375e670cf3344e40ca4313cca90c85370bf17be0ebadc6d
font_02_sfnt_off0001319d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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