Malicious PDF — malware analysis report

Static analysis result for SHA-256 50842d5746dcdb01…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 22:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f355198416a4e218c6d93958813c6055 SHA-1: a6981c4ce7e4247131fcdc68ffbc1b7221fc616b SHA-256: 50842d5746dcdb013701051ba03512ad92801c88c0d9d28ac7f0da6661349d09
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8dcc036253776409b48bb74bf44adc89/kaxafiganakexu.pdf In PDF document text
    • http://hurtglass.pl/upload/file/51237195516.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/059955b7e1c036f89c3fb30d1bf97055/3018615624.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/73858051942.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e8e42fe14---xofolusamawazip.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/dimunexisororijegariwifar.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/54540579249.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/pijarigulokemuvirevukeju.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///34560872274.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/20990278428.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/wiwobamevebinugig.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8bf1a7f743b93a54a4016db543660a92/35441836196.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/pasumabawalezawovoroga.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8mo38vcdov22e84rldtp3v325l/62740321325.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/tufegosi.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/51917879466.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/xazuk.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/45183201995.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090904432780554.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/71996035390.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/desitaletisar.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/36005152346.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/zokememadaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fast+torrent+sitesPDF 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_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 18024 bytes
SHA-256: 7ee24bd7fd14389745fa63a333944a998272857a1950a056da3398cd63b995ed
font_01_sfnt_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 10032 bytes
SHA-256: f85f0669a3f02a7413d7f03912ee2121a0b5dddece4c82b6aacfaa4f1614203c
font_02_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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