Malicious PDF — malware analysis report

Static analysis result for SHA-256 5131333f00241aa2…

MALICIOUS

PDF

91.3 KB Created: 2021-09-04 03:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 206b106c6401ad76adbca9f03324f6ae SHA-1: a605c8aa3f532bb0ad316c1ad9dee77073656d58 SHA-256: 5131333f00241aa261961ec715e94606fe292fc1c37a06dd6ebf61a56515381f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure victims. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://fullhousetourism.com/UploadFiles/file/20210524031506137.pdf In PDF document text
    • https://adikkedua.com/contents//files/vikumaviponik.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/zonapamatotudorik.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/74530307705.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/giwedojanum.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608602e10ad23---tiwozejidika.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb61f9b25bc---numaxifed.pdfIn PDF document text
    • http://erimti.com/userfiles/file/84447278414.pdfIn PDF document text
    • https://superpart.com/files/36697821779.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/98cb44459d2769d59f8d9438fc467943/12797958462.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ebb034007---19080145330.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1703c633cf660655ba3e3642ccd6a4f4/mipusinuxuvapines.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/65224053875.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jahfgiiavtluj73pno04ubebuc/fanedobokugibuvusobamafo.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/2392217960.pdfIn PDF document text
    • http://candientuvibra.com/images/file/dozutosetinadotesetotape.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/vumonixiporu.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/31144835464.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/wajikenazawoxarebalixot.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/85033575574.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107310542097178.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/xemiwegigevokadidu.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/sinunekojak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sortil%C3%A8ge+d%C3%A9finition+pdfPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/bepuragimedu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 10728 bytes
SHA-256: 5d051b7a795548da4675dd5b4206d3cbf43a9bbbc6d769668fa4644675f61acf
font_02_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 16264 bytes
SHA-256: 024e446a57fb3b282dda1574c4403a62d872ae4a864f0d186d5552bf707f1373
font_04_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 25640 bytes
SHA-256: 052ca989574463182cdcb462e75b5898ba1a15d40380481f8f9f10cb00c70482

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