Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ec5cda1236c364…

MALICIOUS

PDF

93.8 KB Created: 2021-09-17 23:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a0edfda3dce31ff905b4976409b66ec SHA-1: 54278779059cd0b6767546685fdbf767158cdaa0 SHA-256: 24ec5cda1236c3644de502db81399a754003b20ee129a91d586723d1cf3cff11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=the+croods+a+new+age+free+online+full+movie PDF link annotation
    • https://izyskately.ru/foto/ck/files/97693410627.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/55200390340.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/pubawekozudu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161403c74d756f---wazinekoxomubufas.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067e6626eb---fifij.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-12/4d0e18b23f545ef98e5a235751629a77.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c9aa2ebc8---96147367733.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/kasugut.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/wosonipidopawuv.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/55195528295.pdfIn PDF document text
    • http://ibb-online.ru/f/file/94226790016.pdfIn PDF document text
    • http://szpk.hu/_user/file/46962204041.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/raromidobu.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/36033668840.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/webesamuv.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/60542892691.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/85299262132.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/zoxaruvepixukeni.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614099df610c4---67639399773.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/wevexediridut.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/brmnngldb4n3mjfq9fm374icb6/xezep.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/zefetufomepobunotubokot.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/23196370.pdfIn PDF document text
    • http://zl369.net/userfiles/file/koxatuvolodonojotarojirob.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_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 18400 bytes
SHA-256: 167cbad40d3eb607c0d56dbf5eb4ecbedb73bb5ad838644ceca69425cef00a62
font_02_sfnt_off00014f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F61 11040 bytes
SHA-256: 3f5fca35b4829f31d4baba47875b36f59d3b43138a23f7b789a64962cc266916