Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae534382c4ed438…

MALICIOUS

PDF

90.7 KB Created: 2021-07-26 03:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a9d66885f1ba17112cb6c489a90200d SHA-1: e50c6de76f1d60c59d04bcb6ddab8f834709b1b5 SHA-256: dae534382c4ed438f36a07b04c8d3fbc28dbba4c0204ab1eb00f3247abedb66b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous compromised websites and potentially disposable hosting, indicating an attempt to distribute malware or conduct phishing. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://suamayin.biz/userfiles/file/31074342778.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4bb5f210a9a22901348f0f36cb8a382e/povujerupetekixusuzu.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b29ca82ca30---67893679406.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/d1b50a0509a3bff47c4e9904f068b778/86022571297.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/68709bdb918813dc4954a0d358f7b5fe/24376554797.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/bodivifivorewadibivetox.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1epoed03ph1c63rmcop55nhq42/62460228659.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/8i07tsfmgftlen87v3loj0f3dv/zoliwumenusune.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/93325944757.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9f865d261a0629d9baee291b889eb40d/newilibovufedivaj.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1b713abbf---bukavorujajawagaguxuzot.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2ce6e224220166060ff0fc6437102632/buzot.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/tixitavevokefigebibafatev.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d0c51796f9c9e0db972e71516678b735/nedixo.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/dekazisuxurinuxowuwez.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/sawolerodugewivagi.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210530152022_1223616077.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/7a6aff77ddcf2a764dd96dbcbe1b9641/35259369607.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/gusoxa.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776d8c0d88f---22078544351.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1g3oqe90eutihqdm4ipnhihe9i/19473041009.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/sofudasejifuzakevajaxid.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/budefifurironi.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/86852352776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=is+there+a+dead+poets+society+bookPDF 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_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 16724 bytes
SHA-256: faffc323fed5c644043ffa8289dba3fdcf93dafdbb4c2812fe3ce877227f4f7e
font_01_sfnt_off00012c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 10756 bytes
SHA-256: dcdcc32002be99e5077901d09b938b3bc0890932005353f787c746db13136367
font_02_sfnt_off000144d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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