Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6613254075fbcd…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 00:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40547429e8ddf86950821081e9e83c55 SHA-1: 104949de6af16b1e46c1bb02c4c0445a057339f5 SHA-256: be6613254075fbcd7aee239707b432759fe402866c9fb015c106ca44e247280f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many hosted on compromised CMS platforms. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a malicious intent to redirect users to potentially harmful content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=how+to+create+spinner+in+android PDF link annotation
    • http://bassbasement.org/userfiles/file/48162402452.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2109062027078455326fbxc.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021092400121756.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/99018612169.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/41046480383.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/zalorisibipirelegizemek.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_045356.pdfIn PDF document text
    • http://yuhongzg.com/d/files/83471591671.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/51578691855.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/fuxezipegosewupolibe.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/31894356594.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/57821028672.pdfIn PDF document text
    • http://labonscafe.com/userfiles/fewotorifosi.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/vijitisezukeliwita.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/bovumugugowusu.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/2556042124.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/ronapuvinekewov.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bbpavtkrjpq91tgq7bp3it8770/61941418994.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e12e2683c01d3db7d2c1e38b888bd90d/99697689845.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee72761c74---tidokun.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/47813126892.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408cceb2bf7---lefitoneboniludufadutiw.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/sexeriwarisopuxogilifog.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/wobufixuposipigefa.pdfIn PDF document text
    • https://protum.se/file/79318194368.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/nizipamatufitaf.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_off0000b1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CF 15068 bytes
SHA-256: 8c044cd177cd334ac579a93105ff6b7d883eeb305350e7428da1491023ef389a
font_02_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 10536 bytes
SHA-256: 8053fcc946fac3d2d70545f268f2d48eee9648d238e4f08c7b58ae30193f5439

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