Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f27bc6f595cadfc…

MALICIOUS

PDF

77.6 KB Created: 2021-06-10 06:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1263ef7087b406d21db3e3e5b1249bd0 SHA-1: 631b66205c9626b499b3d895509deb4b0664caea SHA-256: 5f27bc6f595cadfc599dfdaaf41f0ce66db9659eaf575502073bf0e8b00b75e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to a 'guideline tool apk', likely a pretext to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=best+8+ball+pool+guideline+tool+apk
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0a00be49b9364b900bc21f07b2b0e66a/nipitimukujun.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/714c0b87317726258b36f704f4a056af/65100220018.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/54j7rpih3top0pur1eo65lvlhp/zojilunobipepetazuw.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/k5ojf14kgik7lr9qkji8e04pf3/nofatuwutujo.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/towirosiwevupenuxizudoka.pdf
    • http://www.annaleehuber.com/content_files/file/88592044246.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde9d317c9---dozakitazexolofaxavaz.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609835bb8173d---37530332032.pdf
    • http://e-skala.pl/userfiles/file/73632354922.pdf
    • http://zae.me/datafiles/file/pulub.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc694ffc6---xikapumuje.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbea9e75a0---jeletedunenebatexamaboj.pdf
    • http://myphamlulanjina.com/upload/files/534611721.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160807d5524d78---65735740869.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1ioe2pmb04u9vh0m84uiu5etf0/74265376285.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m9qmk0dhs1qcln3eu68inm1304/rotunapijonipo.pdf
    • https://balajitutorial.com/admin/userfiles/file/71934317769.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea79.bin
fac01c0ea947c14c58fe30aa803e1cc941857e185b96ff490fc11fab64f924b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 5360 bytes
font_01_sfnt_off0000fcbb.bin
4f0f0ed0f2328cb8d6b4c3a0020e406d978ccdda7d4705ae4f959d652cd8780c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 10544 bytes
font_02_sfnt_off0001206a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 4324 bytes

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