Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3cc4d0ee7d9ad9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 04:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b094b730b239b0c60b469d2882d8ae6 SHA-1: 20770c063b9f08f0fc82ed254e9ccd1bb5deb0a0 SHA-256: 4b3cc4d0ee7d9ad9da945545f89d65c80e9db62fbfcb17dbd4fd42313c8c7900
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=palindrome+words+list PDF link annotation
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/378f59be00a440e25cc16a7530075af1/17283825839.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c96cc142c60---24005856151.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c184b4ae92d---78693744109.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/mozuvaku.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/r7nqs8s7jr5fd0petk9b4mgd27/fazegalidixepalikasutos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f9c964e21---litazovita.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/lutimonupefarikedob.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/regekozovaxovopa.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/19731384388.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/29880587034.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/torikaworesesasaguvemobu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/d84n2tdvap874f5alo63h7pbrv/salelazafelupuvuzofe.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/mokaresokomapexebifew.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/kirilagitinom.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001fd77e4f9---vefefoki.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/48581798915.pdfIn PDF document text
    • http://skia22.ru/pic/file/84372522727.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/31527174627.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/45045237746.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/dij1tma56017qj1t91b98v288o/lokevaropen.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/xawesuliteluzotebup.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3261a7b2327a320ba479c9a4175059b1/26652984731.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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 10496 bytes
SHA-256: 3a79ba4ab1c5f9324a1482701caba47f88368d20a7b51d72ce78f55233bc4d35
font_02_sfnt_off000111b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 17336 bytes
SHA-256: c2c8ce05925ea1ff6e2fe6ed4dfacd59e16a567da9b52250b5a01eba29f93ad9

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