Malicious PDF — malware analysis report

Static analysis result for SHA-256 b571c41da1ad70ac…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 21:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3568eaaa5ad65d0719b95294223c232f SHA-1: 6a5179e5b5187a6d408cb4b6f2f8a3a7758cb2f8 SHA-256: b571c41da1ad70ace61bc271ff97b1cc8a86173e466fcda5258b061a17dcd2a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs pointing to compromised websites and disposable domains, indicative of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=how+to+decompress+a+rar+file+to+unrar+on+android PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2b1b1c14148e59471e8a7b0d6bb20bef/63394167488.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/renumarotujun.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecfd0c6cc---24147000075.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614791b1586e9---lidukosiruwo.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/ganafezumejimutupufuj.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/032306157626.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/90789740212.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/jekugiregorenirajubejir.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/33235054839.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/66125630283.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210911052359.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/13f4cf258d938754b22fa0de19a37776/64676761292.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/51704964372.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/53963315436.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/votuvuvowazugekolanoluve.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/57030797686.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/venoxofulul.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109100804223588.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/xibenitoziwasexurikupi.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/xugopatijepadikoxalujalal.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/5368132482.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB572 17248 bytes
SHA-256: c3ca17edb9d82df19516622207783e8598cd162ec8c8b8ec81b3251e0a1832c8
font_01_sfnt_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 10956 bytes
SHA-256: f5c1e0f0f7a54290340da164cd80bfd14a4cb3f69aaf8659c0b5879259f19271
font_03_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 18220 bytes
SHA-256: f476e6f90120bdb8ad888f02f5eac03bb9370c6f986ce8fa1783473a675a4c77

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