Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e50e848428cd57b…

MALICIOUS

PDF

76.2 KB Created: 2021-08-12 07:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a08f74378530140e6ac3c11e9f0585c0 SHA-1: bf82c1b4a974b342cd0e19e9270df78c8d23ecff SHA-256: 9e50e848428cd57b6eaa7f7ef29df3e6125bbdd81f5fe0add0eec086b79bf23a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves tricking users into clicking these links, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/luh9pqtms4a0lgipbv76u4ha2l/81171149288.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7dccae382---davepakefeduva.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/91719249697.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/82175802188.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xazoropudenax.pdfIn PDF document text
    • http://tipiland.net/upload/file/vufiruzuvuxavupegemi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/21651274026.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/495956147c2358837d89036816f14109/46733814428.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/74064808595.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fe10b6ad9b76d2475ba0ec49768b8287/88038123225.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a215aa80---8085977351.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/76347787622.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/zoxibaxajumufileweb.pdfIn PDF document text
    • http://metallpress.ru/files/65781615141.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084366a9f8b0---bojokekapukowuj.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072dab7e838b---mixejize.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c7c0ac7a8908eeec3c5f4e705cacdcb5/65874366603.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4i77fl5sfql60i166aok9tokad/49865157589.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/musexuw.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/jejijuruzam.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790ff0bdc02---48708621402.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/baa3648c951d44921c2ddf30f9954370/11324170023.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/78813172436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=metodo+simplex+maximizar+ejercicios+resueltos+paso+a+pasoPDF 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_off0000c57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 16948 bytes
SHA-256: 5230121cce8533326ab81e16d5dfcd29d2c186bb649cca89516ea9e38eb1fd56
font_02_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 10956 bytes
SHA-256: dec1133a0fa9c19db3fc3cdde3d68e72dbf0a589a1d2f41bcca64b0f1fc8006d

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