Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc65a9d7930b7c72…

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 22:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a91f3e6e2ee6c51c31e0c8df0d55bf6 SHA-1: 942aeec4dc416b15dd1d16256fbe9357bd7aee7a SHA-256: bc65a9d7930b7c72f3b13ed650201391805edc9714cf45614de005a2519c260e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=android+sounds+for+notifications PDF link annotation
    • https://tiemhoahaibara.com/data/dulieu/files/zigaxomezelat.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136c6d193242---jizabejilezudefinak.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/zitegek.pdfIn PDF document text
    • http://josquin-capella.de/download/20182696079.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210905141027.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/18d3531036281898e1fd80b059aff968/kimid.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342b9632e75---rekibu.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210905230457.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139808c6ae53---mizolipujerekemi.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/bd15cd6a12afd51f59fd8fd83579704b.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132faedcb550---rofaxuvip.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/59553503129.pdfIn PDF document text
    • http://fluorescent-training.com/file/43171216029.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/dd4c0cbb09a68f6f5ac502e1d14e840a/63885153137.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/12622853654.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/10403841358.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/62488049329.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/93299840089.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/mawerofirivakubigiliriw.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/13689725558.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dbc9877ec---jowixosopixezarufolijusif.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/lurijeluteparigo.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/vaser.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/38930963703.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_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 17668 bytes
SHA-256: 69727da652c0d2a63bbd207c0886d824a530b45d5a39270b84e3637c51c6ce52
font_01_sfnt_off000116df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DF 10372 bytes
SHA-256: 3f0e165edd703bb6ab88efbf34919abc74d60b9c3c2ae9b73ea6c1731ff89a25
font_02_sfnt_off00012e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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