Malicious PDF — malware analysis report

Static analysis result for SHA-256 9250d157f3251acc…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 19:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7c17457051ee306731ef9e5819a89aa2 SHA-1: 04274d874e5fb54f6339effe8fbb6940dbaf09ed SHA-256: 9250d157f3251acc0d9c66a1f8127bbc0e0ec18d5ae58c6be720a324310997a1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and multiple links to external URLs, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • 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.
  • 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://proxkimya.com/resimler/files/wujifopo.pdf In PDF document text
    • http://gaytonfa.com/upload/files/bupowamapalidapexokoru.pdfIn PDF document text
    • http://z500.si/files/4862510224.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132937436b05---2605460980.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/90423175458.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/lenitemuzubitozoxuwagegot.pdfIn PDF document text
    • https://digireg.it/upload/24161099410.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/rexemanunexasevasifebo.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/42618539670.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/85179045905.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/q4thq73qbie22pibustgneu017/mulegupedep.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/7931611167.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133813b69ff8---jedibobekukiva.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/vopudibakebikadukufezuzoz.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/gojuxijewol.pdfIn PDF document text
    • http://kustari.net/userfiles/file/kugadasoxezilelewimedar.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134034f1dff1---mozesabitutoxasakunukok.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/pawivobu.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/82012348682.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210908_E94E993A7999F720.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139995683f8b---bedilopibawop.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ede36c91e---jawezemefesakumov.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/sitomejis.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/dokoxajogifefopanafosit.pdfIn PDF document text
    • http://0048.pl/48files/file/53736706555.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/51372920389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sip+settings+in+phonePDF 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_off0000c430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC430 16648 bytes
SHA-256: 0d2acf6ec4806c27d49d9df29070591b5041eb91bc3b2d815554b00c563d98c2
font_01_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 10300 bytes
SHA-256: 4a1589f47dbe626f182dd4232ff85542fef7f0d90b5d6cd8ef0643c1809dd49e
font_02_sfnt_off000105f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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