Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1690329a240e199…

MALICIOUS

PDF

83.8 KB Created: 2021-08-01 06:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b720729ff406132ebdd0eda2c842adb4 SHA-1: 60dab29498324211395518e55f5958af15713bc4 SHA-256: b1690329a240e1994313440c87e048f32c1c44e1a3eacc1a23cd61375d3a0ade
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. 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 document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9801

Heuristics 5

  • 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
  • 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://shoreluxurylimos.com/userfiles/files/66024662808.pdf In PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/16823532190.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/duwapojutijolibigonomonob.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6gn6mi9bnfrludod1li6e3dnb4/30058671664.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895d3d98812---3694516867.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/faa3c4779ab23fd4268512581d57de23/23263025240.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/dojos.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5aa5f4cc06803361f79d4358a7797202/11705357168.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1625159979wogifejuloxedivadikax.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edf25b51eea---73425292678.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee32e01c0---zefuvavefimalolaza.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9c96b2af---sajijobajimo.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/66836840663.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082be807aabc---36429202486.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073c43547970---7550531561.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/uu35cgnquue69cje73hq5dh0j0/lilajoxovivalegumovogi.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f18713da6---xozazigonubu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3a120fa26a00b4ada6d878b907521774/10349481197.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ffbocg4lppb5it0bjhf0l1frrt/tewubitazatopotowume.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/78d5ce81f318241851eca861e0dd7a1b/27041694547.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/papiv.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/64402925324.pdfIn PDF document text
    • http://dzbnf.com/upload/file///91452060490.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e4641a8bc---xiwoged.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/86923475952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=can+you+add+a+music+bot+to+a+discord+callPDF link annotation
    • 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_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 10784 bytes
SHA-256: 0adef80d615928350ab31983741f37051c1f2475c501189210c397be7d412d00
font_02_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 17068 bytes
SHA-256: 70bfc4776c728d35be0ca9c5e732b8f5b612aae51a4684539af6afcf1cff174b