Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d3132e85e61296…

MALICIOUS

PDF

76.0 KB Created: 2021-09-20 02:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1aab87e69338a813f5cb50f36493d4ad SHA-1: 8de63fec1c2542b70890bb224e52c88eab3e44ae SHA-256: a2d3132e85e61296743213d13716b633dc127d7a51bf3d9dbec2e5a245716cde
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites, suggesting the document's primary purpose is to redirect users to malicious content. The presence of link farms on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=reproductive+structure+of+ferns PDF link annotation
    • http://vatlieubaooncachnhiet.com/userfiles/file/48150915582.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/zopavefisikazitemevaliz.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/212c3934ced7bb7faca687a57dcf3eb4/65622493100.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/98692778327.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/55509537895.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/robaruvogilalinagovu.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/52192348646.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/muxebapavurabuximikus.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/lixijelatigika.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/rimufoxetadipigozi.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349fff4a063---maragovovarixuwosate.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/wibiroloxewarufidupus.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/xakuzabumiritotaxasud.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/rufofedusesipufanewikep.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/7756663000.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161436f249da1b---bazogofewavewipamum.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/sedifimijitelimemomepe.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/porawitazafoziriki.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/p9p9hu0af68i34s6cvvlrt4vj0/78243732442.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/pinakalarag.pdfIn PDF document text
    • http://btfa.tw/upload/files/filigevobirosop.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a109d850cd---28463676516.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161305b29aecc1---98306750984.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/zujozodofibo.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_off0000c623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC623 16824 bytes
SHA-256: 785fe07b46ffa64b156a9001af7fb1be69a53e8fedfa9b73768ba670f915a8b5
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 10616 bytes
SHA-256: 23098a64ccf94e14b648a9239fe62549f37ec415120c9636c12f46502e5cf274
font_02_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1