Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fce87e207488a2e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 06:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae0fed2f6c5774c8e219bca5d57ef2a5 SHA-1: 6915fa4a4375e2325bba5bac0642647a44835c35 SHA-256: 1fce87e207488a2eca07997633bbdd07a40704fd605d90bd76f824ab04bb5942
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161397ac298297---86781525809.pdf In PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/57776033102.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/36644810654.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/laseduvawovazafavev.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/32949106432.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/uqmehn8lmnj5i9t0tu3gr68s1f/nosufuguwozodev.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/tolirumezibojisiwogigusu.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/34388745209.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/20953517645.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/mimumupurifaxora.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/41534973815.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139db2643eaf---koxejo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161349ad21234c---sujivovofeloxad.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/73685975227.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/bosapori.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/nuxapivamivewez.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/vukivajiwe.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/62ljdt1dfmjnn0ci7u1nf6hofg/dorogad.pdfIn PDF document text
    • https://samowar.me/upload/file/bowuligebivijurajedaweru.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373543cd9cf---fosejixobigo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325d05aeb71---waxukelepojimifikufu.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/90758769445.pdfIn PDF document text
    • http://quetthe.com/upload/files/37566809733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=javascript+barcode+reader+from+cameraPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 10828 bytes
SHA-256: a75e0519d904453f0ebdaf35398f5b394f9c90e810f6446958bf0d66fcdf5648
font_02_sfnt_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 17464 bytes
SHA-256: b8c0d1e3c559897f48fd58f0bb173de2627681d4ea4c16834d3e69c601daf09d

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