Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cee681b93e35f8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 15:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49e0d2c5d57a228adff256f82f429d81 SHA-1: d01f4e8c990177531ee12974df2be154b891ff3a SHA-256: 54cee681b93e35f8bc031f0e53042a059ac7f1a329d9adaeee842e3d137291b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript (T1059.007) and the nature of the links strongly suggest an attempt to deliver a malicious payload or redirect users to a phishing site, consistent with Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=your+lie+in+april+characters+names PDF link annotation
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/wenanosupitawowedonom.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/kulixuzubomusive.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825b9a4850---momuvokago.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/fenutujudumegawufovuxuka.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/fenowuwi.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/62395448663.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/dumubujofor.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/jubatipikapibolaxepu.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/93280733855.pdfIn PDF document text
    • https://securitydm.com/slicice/file/tovutokuxokuduponi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614165f3e5e06---bifiso.pdfIn PDF document text
    • http://vildmarksjagt.dk/userfiles/file/desapevavo.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/kevumunaregugujaximidod.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/46280357365.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2f84541edf93485f47eb45e3daf8a7b0/didimoxogalam.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/55199540546.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/gususigifopu.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/zodinakakepememiv.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16134a65a216f5---javixivekunojin.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8dtrmva9qiqgmgr74428o5t712/komosasokoderuj.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/43495810599.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/182367530.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/wubuwunenotiku.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090617071826.pdfIn PDF document text
    • 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_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 10720 bytes
SHA-256: 829d1482160b92b7d47ec96380415414b05a4208fe34b531257e60b30be97622
font_02_sfnt_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 17852 bytes
SHA-256: e7cc3d6ddf266a35f00f833a27b9565fd5cb1fd8ad5423a6c1a4175f62f0b0f9

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