Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f71daa408c0dd17…

MALICIOUS

PDF

92.5 KB Created: 2021-07-19 01:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d6d1a3b0d31ca4deb6f8c41eabd7a1b SHA-1: c47c5b9edb84c24c2f663b33c38f0fd5c6d8eac1 SHA-256: 9f71daa408c0dd177a93f9b57cd88750113ae1bae9d72f237866406fc1bb9423
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external URLs hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the presence of numerous suspicious URLs points to a likely spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 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.
  • 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://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/80958059431.pdf In PDF document text
    • http://gps-tw.com/CKEdit/upload/files/6357706854.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607affc13ff56---bifagi.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/82072904507.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8585ad05---16329192130.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8d1aebdea19e574d84138b2da94fa3b5/44024072714.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0cdcc3512---wefutubewivubuw.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f9eb0ddd3---51103371063.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/11567284146.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/d8bcf945389b67ef4f5b5f8a99317718/wagibatim.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4156ef1bcd6f9490070bd5c5ecdb6e74/61678187466.pdfIn PDF document text
    • https://studiorampinelli.com/file/xulop.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/xidurelulixaxakeke.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/86759776cdd50d78833fdbc6b5f6b4c5/34212884252.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afb88bd4cc2---bekorunofu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bedd302648a---sazetajavitabafete.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3c983b298a6209644ebc75ff57399934/40759187337.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/tiwutenivedokazona.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/e7k9vderm9pv078tv2qure9ve0/nukevepopivisexesagito.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160910366a5cfa---vonopudezukukumabexi.pdfIn PDF document text
    • https://ddms.tw/upload/ckfinder_temp/files/20210701025053.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/muwube.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/98389689040.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cf80212add563c5c71184647941b8a7e/24773890227.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2413c3d77b52b5114433326aab1fe1e7/59124356723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=this+photograph+shows+a+nonconformity+in+the+grand+canyonPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 11184 bytes
SHA-256: 80183d94e71ab91790b47def2fbb420b05090c0818ff78783abba5c1914351b1
font_01_sfnt_off00011fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BE 17020 bytes
SHA-256: 42d102247e79ca04f52958bdf8c2be15be9cd44070a5f9d39a997c0a8a7b3e7b

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