Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8884d5aa167cd23…

MALICIOUS

PDF

91.7 KB Created: 2021-08-09 12:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6eda2cdb9f65ae42fc1bf4183f42bc71 SHA-1: 287212b4550984bb2ab04e11751d1e107ddb2f5f SHA-256: a8884d5aa167cd23ce35b7b6becb0387dafc025cb5c7a7c467e81e3da07d5b81
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to these external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089750422cf5---39662987529.pdf In PDF document text
    • http://wenxuezj.com/images/File/mufozojuk.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/wimanezogu.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/zifabikineselajinuj.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a202b862---43597582523.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/birevixufulamikafu.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/24410007616.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/zonabagezarebuzekewere.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/gr6tu6i83dqofb3rcpcdnfjc2b/17688300137.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6s2t9rmsdaiart8ani45q826b7/23074183069.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/butegasoji.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e0afc655e936b448a36c61e1e106b4f4/77724157621.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a528e994fff---21517096413.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085587ea960a---991250385.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160818251099ae---70118961741.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d209b90fb86d5d0595d4ce99476e0674/kitoxolumit.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/lasopizopezevavunovalos.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/vejozoturotodubosedewaxu.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/83682511328.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/7942404214.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b182a0865b2---14078264707.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb4cbf163---pazivenukatoxo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fdd32f71---70441536970.pdfIn PDF document text
    • https://activepymes.com/pub/file/33071432814.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/747272c27e48bea1ab537e8cd9d58194/wevuxugonifomojefurodarag.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/61527325356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=student+schedule+template+google+docsPDF 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_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 17916 bytes
SHA-256: 5ac984736df1147a926fd8b208024de2c1e5d6ab4553299af221e37f45975d12
font_01_sfnt_off00012e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E63 10944 bytes
SHA-256: a8971f8d3f431952277545c4bbb3942b3f6ab6b47849133b0c742c7ff02eafe3
font_02_sfnt_off00014762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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