Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdfad9f8b082053…

MALICIOUS

PDF

156.7 KB Created: 2021-06-26 05:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: afafcd0a79d5fb837a8c0103ac92885d SHA-1: b8b576892f2098d324ea8cde9abdafa0774ad2a4 SHA-256: 6cdfad9f8b082053873c828b05030ffe15fc9dc4d188eef90db33de2c0b8370e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://huntic.ru/uplcv?utm_term=brooklyn+nine+nine+trivia+questions+and+answers PDF link annotation
    • https://inverpalmas.site/aym_image/files/mawiganosevodufos.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608586df422e0---4601961079.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/324109642a3cd02badd03b66bdf0b89c/59181239748.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160858ade28f97---78317183303.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2009f15b1---96267812597.pdfIn PDF document text
    • http://ahchala.com/img/file/mevorazitotazolelevope.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/d73rge1gj62pn6vn67ovv19gab/jejamiludabanufij.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/kikofogonok.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fa956a5264c4cc0d09c10b95df578cc0/95386185185.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/4252d5a3fc6bbf8cccd9e02459156007/45463447852.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092848a7c155---sofofen.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc54767d119---kawisagat.pdfIn PDF document text
    • https://efnnma.org/files/file/21472475415.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/nogefemodoforomif.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c1eb89c07a3e9667bb66e551c254528e/18275991618.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd727424d---14494102439.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3507d2a02---1042118459.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160cd955469c42---sukowe.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/kamuz.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16075c167f1874---fesuga.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade8fec4955---81074637194.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/21306133173.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/1be043c5a99ea98a01c78c0aa27c95c6/jimuxakubut.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096adab23f52---38739152800.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-13/20210613195510764264.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/qlokd1du480682nk13lnbd5hnb/52924267140.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_off00020561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D78 10896 bytes
SHA-256: 2aeac382fc464ae2cd7bc8832c285ce178e5ca8ae32b8a90e2e211cae7dcb493
font_02_sfnt_off000236b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x236B2 17688 bytes
SHA-256: e53ddc642633853f29d5e49cd0855b4c17e8f8b994fd7db63de5c7b8011a3a67