Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa929dd5e14f8f1c…

MALICIOUS

PDF

92.5 KB Created: 2021-09-09 01:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9eb79b686ba3d9d21738f56d22f5679c SHA-1: 8475ad22dd6fc21d0c944346ffd47d87a098d025 SHA-256: fa929dd5e14f8f1cc80d3c460a693549b82fcaddb7e045e8cd8fdeaeca7c23b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, directing users to various domains, some of which are hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL distribution strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.jindatunnel.com/up_files/file/22886170764.pdf In PDF document text
    • http://thangmayedex.com/webroot/img/files/zinapupelu.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/sirilabavuluzagodag.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/92418165564.pdfIn PDF document text
    • http://grafitym.kz/files/file/84166450938.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/bukubevosulevabiga.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/lapatakosibam.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210903011335.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613926dd4af90---kidizokiganubodakikig.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/mesofilewobuduj.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613603b02dd0c---96623363228.pdfIn PDF document text
    • https://oferta.lt/i/File/selipitemezasufapapo.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/43156705336.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///gusukekalukonunedu.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/rozidojilukedulamakefi.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090522075873499.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/2825239032.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5f0f1fe5---68521806213.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613329c1b33ba---jinozanava.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/54606107693.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210909_2e20e.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbda0200c---62139543249.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eed7eda22986ef4d5a95d4f070b8ae31/zopomokokamejikixe.pdfIn PDF document text
    • http://sbairs.com/datas/files/mepizusolomupulixikad.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b73e718a482b55731f4d2fde4591cc19/mopafovawen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=iphone+11+vs+note+20+ultra+cameraPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 23520 bytes
SHA-256: 4cebae31d36092f8552173c63a4fef07a8d6cb86b9d6657c5e2c94869f208c17
font_01_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 10960 bytes
SHA-256: 2d22738be8fd7ac2e667a4659b33070f23213aa275cbad7241456ff0413818f9
font_02_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_03_sfnt_off0001439c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA9 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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