Malicious PDF — malware analysis report

Static analysis result for SHA-256 b506a706b1e16396…

MALICIOUS

PDF

95.3 KB Created: 2021-08-10 01:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31bd4df7adee20331896da9996c83725 SHA-1: 59d5d04ac65174cb251ff4f2abd80f7361892feb SHA-256: b506a706b1e1639614be7c39d90963e4139a5fda88264ea65dd0465b4072afcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://smidgel.ru/uplcv?utm_term=understanding+business+12th+edition+pdf+reddit PDF link annotation
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4588facdd6---32962968898.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ee5e82389---sefarepi.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/xasaj.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/taluxivumiromafatonired.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e8537252b1472e9e00633714f8a9d34b/vapinoxedirelerigepofovi.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e58d6d1a5---baponaso.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/46821420840.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7748b2e11dc66f52d0115addb5ab99ff/92993114514.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mbmsna40ebenj5h6udpd64frr5/melifu.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/82889982422.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d6b0b3eaabf16c0ed42dc1970f8198d8/58666732365.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/121534169.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7137c9121ae0959c2c86c4219ea82da8/88830357298.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/lewutufuzusom.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/p1s4sa466refrmv99c0d2h5kjs/mafixirofebedumara.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b838861ac---kuvew.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/49997332937.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b00371125e454592a9f7029d45b3bc87/95681787140.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/kefora.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161098ae07cb13---gusikike.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/45897545073.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24cdc62b7---lareje.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_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 19288 bytes
SHA-256: ae4c6736d438e5e6f31de8721a4842172ec127cd9d847c6ceeadd7189adcd1cf
font_01_sfnt_off00013b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9F 11152 bytes
SHA-256: 8095672a9b86f98aa0b3fa0b99681441d6fb037a1c990b9e8f41389bb400ec7c
font_02_sfnt_off00015547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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