Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aebdee8825b3856…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 07:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93902025cce18ecc94d82e9dcd58b6e1 SHA-1: ccf4f95b3e3a0af98a67dc0caf069b3c89c1d407 SHA-256: 1aebdee8825b38564f85291a6693d2bba99a01ad16d96cd0c4390e73152b1239
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/kulipepizutadotuxeboren.pdf In PDF document text
    • http://michelschuurmans.nl/images/uploads/file/binok.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c6f8267482fac38093aa16139b5e17e1/58677896467.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6cb2be21e---sezozonakagirajujeleb.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd4dcb473---texutun.pdfIn PDF document text
    • https://paperland.bg/uploads/file/50283078025.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740e28b1f37---24245697474.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/tizibaverewanizupo.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/3hiorbbo43npjuioph39m4a4po/bodumeligibubiz.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/kepizedu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/uo73fa8k1gsp59ss8jem21pejd/81405282059.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6820it57ucr2626d0am6mg22pf/buwalisororavakodadasoxo.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/julakizulodoje.pdfIn PDF document text
    • http://vizcsap.hu/files/file/radetojisuto.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/41635637969.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/sivariwewujopuxetiwuziso.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/99117350315.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/08u369d234iv1s24qf1q5bt3e0/55943882381.pdfIn PDF document text
    • https://medius.sk/userfiles/file/duduregatoli.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/fonedinigufevezusovu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c3008cca26450a9691ddf1caf83bc251/gobopoda.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a18893b1463---darozago.pdfIn PDF document text
    • http://veivel.com/userfiles/file/jodarakixadunokavalujisom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=classical+mechanics+books+pdf+free+downloadPDF link annotation
    • 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_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 11136 bytes
SHA-256: 3404fb860daa5f38143827d695f013cf8e3788a5f31f8cfc8518069b72718548
font_02_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 18188 bytes
SHA-256: b167ed25a8061ec670da675bafa013f6c45509f58da1a734dfdde370aa66285f

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