Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09ba73707cb6c05…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 09:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf6c64879aeccd44c73cf7871af22890 SHA-1: e77ffd0101c6f79eb89936957ae4d4a1f2aa3417 SHA-256: b09ba73707cb6c054806c34406f3eb342ae7e7ec885e6f53c46ef1e735cbde34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://pistant.ru/uplcv?utm_term=onet+animal+matching PDF link annotation
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/52474172578.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/570bdmu6a3i27eg9cm30f176t8/fitike.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/15810740972.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/kagaromuwapinataje.pdfIn PDF document text
    • https://mar3ol.com/Files/files/xemupaletevejarevowopijal.pdfIn PDF document text
    • http://bigbulkbags.com/survey/userfiles/files/banetokavuwepi.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/011325296869.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-16-14-59-26-45.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140fa4a60965---barudabesukupu.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/95250421967.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/48549240622.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-23/20210923173736331019.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/42836123720.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161329d7b9a1c7---penaponof.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/40756240936.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/lubibinopaduzozuxumeraru.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/29723247541.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/21912309089.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/luzinumaxa.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/98120384625.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/93295554436.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/bojobazetufewavuma.pdfIn PDF document text
    • http://4yoga.by/pics/files/tesasukemakolejol.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/nuvofotubemamurasinarubis.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_off0000ae1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1B 10312 bytes
SHA-256: ef501c5df0cdb3ab69b48d48f312e632ac86e391942697c7ac6605624f48a043
font_01_sfnt_off0000c533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 14920 bytes
SHA-256: 3297c9743e97bfa60b894d9714dec07a73a7a9399451560fdea5b864bfc2b726

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