Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b02ae28f5b94e1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 06:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0415f2bb60a080d33f7a817841708eaa SHA-1: c45f1a2d84baff9dcdbe9f1ace6c53c021c71d96 SHA-256: 20b02ae28f5b94e17d7d64d3954249f2a69284ee17f4978f2c991a61682f0e73
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a high number of links to external URLs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://medvor.ru/uplcv?utm_term=adagio+johann+sebastian+bach+pdf PDF link annotation
    • http://clinicaveterinariaalbese.eu/userfiles/files/tasorozodolegexoroxofo.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/39396488990.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/87632637947.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/10892490123.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vevapupuvatobiwe.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab3ff220e---kakenafogekamaxu.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/sesuvebuvuwusijuminiwaxe.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614087803759e---migawixegi.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/rebizaz.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/zixibifunobaruposu.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/situjif.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5b3c2ea3fac1f7409a4d60bbd20083f9/liridugu.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/doxipulolotogikuruwiz.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/zisegi.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/99313983669.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/wizubemubuzotavisivojezix.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/25848881946.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/sedupitofonovutetodimolut.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/bemurawiw.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210918121309.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614226a913d28---50627369507.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/14653714904.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/repasugemavuxa.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/zodusefojetobulalanijan.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/xupirovitiveruwefes.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_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 20380 bytes
SHA-256: b7df7445dd71d63da682215b760573d99a0d0758c7094eaf73604fdc27c635c2
font_01_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 11004 bytes
SHA-256: 8c1f0a71a408d583d14598934df4c3cc7a5162b3c5077b05ff1231da2a3fc73f
font_02_sfnt_off000132a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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