Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed43e58650ae2047…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 06:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4291829512ebb0d9098b82bf1a41927 SHA-1: 4a5a95d33588cdb28f385ac1035afce6d502411c SHA-256: ed43e58650ae20475307564db119106c2b9451c0733c8b00ab08c7d93b7993a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://chiaranannini.com/userfiles/files/12962704931.pdf In PDF document text
    • http://kurumakaitori-one.com/js/upload/files/38793066832.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/tuxibebujat.pdfIn PDF document text
    • http://tencanpowder.com/d/files/jemalew.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/vewinilinina.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/86173611347.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/84b5db2a728196b942ca42a4fe2bd864/xogav.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/sibanegelumefimu.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/c59f3278db3b691c0f73eaafd82c6b84/bavolobipup.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/birilafosutu.pdfIn PDF document text
    • http://wamer.org/userfiles/file/buzajefuwesiwinunikuv.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/mijubawotogit.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/18985233957.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/42165374769.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/jazosoloxigevubimore.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/xufulefifetakazofufuved.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/29470989910.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/6259753778.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607341013b14d---puzovepibugaradiz.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94942c6728---73337954322.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d353dee6---18216950825.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///lokopexanimofes.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/gatogkpbqi8peu2dshcvpiitjj/18869805634.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed69fb4de4---loragidopiwifisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=interpreting+graph+worksheets+middle+schoolPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1ba0da5eced21aea594631a519d54c81/losuxenibipegejezo.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_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 11092 bytes
SHA-256: 3565ddbfd2b747f14de263b37eb12fee00e6702d25005f675bf8eb51241555b9
font_02_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 17848 bytes
SHA-256: 8cd2dae44222472d6eb6f8c91ac4c8c4b154608eacf702e18fcb26e0fd8bf5ab

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