Malicious PDF — malware analysis report

Static analysis result for SHA-256 f581f4686c8df5e4…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 22:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1046e4855216273be530ed9be75a00c4 SHA-1: 9b0a15d06f6327cf21068268e2cfa38c7c39ff9c SHA-256: f581f4686c8df5e435cdc08a802e1d4d7c2fc0bff2048f63436f85de62a7db2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://crewmak.ru/uplcv?utm_term=internet+and+intranet+difference PDF link annotation
    • http://kasaitogo.com/uploads/files/woxefapiko.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/37ad11cc23a81b2e111b0358a95f1a6b/26488159410.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hqs6q3nd10k0bap6ut379evvj6/jibavelebujufen.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/21859573999.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/74929623796.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e68ed0edb98ef02c050edd991ec1ec1b/rexiteridap.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb729abd25---kawejomanulepofit.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/90061189441.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/pedavipikaluvuwiroto.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1e4d9993---zupomasebukolataxuzebevix.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf73a8470e---91099669684.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/78228279776.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/vujedofaxetajosokim.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/3cffc6877efca74491da18c2346cfb1d/bufaz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ef9bf23cb---40363513720.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/bc8fab9175c615997c4c4c2a07d6e091/fizabakidevifigurezasilu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/be065eaf03d92b538823a487bd186e01/jikamivupefoxozazoxove.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d09c8c25b0f87bb388f8fae5efd43ebd/zatem.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/0dcr39udm3rr6r0d14j6rf5bqo/50799961788.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uaqqfrrn46rb2cieatm82bl2g2/41636106256.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/3et922g4djilhi9lp4u77df9us/64448068016.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/37536818735.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ac216aa7e2a---38918493445.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/38684608489.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609f169a0e98e---vokasezasowonovaniverin.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160836f04d8d1d---demogilipelag.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160804ef2bc5b9---67155319938.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 17216 bytes
SHA-256: 5e07abcbd84e757e410000747629c9dcd7a4b723f232210b6ffd5cd2f8e93b56
font_02_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 10088 bytes
SHA-256: ee36342f150a06c95397455d2804b295af2a1771b85180ccf968a0a8f0daa36c
font_03_sfnt_off000131f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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