Malicious PDF — malware analysis report

Static analysis result for SHA-256 50318fda1d20938f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 10:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34fcc087f76d5218e92960ee644de197 SHA-1: dc92c22998786daf2043066ba9e80152180555f0 SHA-256: 50318fda1d20938fa201e1d41b1e77b31a6c63cb29fa9d7e30b8ff46858da2a2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm or SEO poisoning tactic. The presence of embedded JavaScript and a high ML classifier score, along with ClamAV detection as 'Pdf.Phishing.Trojan', indicate malicious intent. The primary goal appears to be redirecting users to other malicious documents, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://georgewongdesign.com/gwd/upload/files/625699110.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mbjsk8f32ii4cif1ng0hei6rg4/vofam.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/fexosepo.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/18310848615.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/453621529.pdfIn PDF document text
    • http://cissi.it/userfiles/files/44784278974.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/vorotanabozixulizalin.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/46251464062.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ba142dc3d---35932042022.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/57410275470.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/mobufigi.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///17898551101.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/75524778805.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/92710164186.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/46297025831.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/8421742417.pdfIn PDF document text
    • https://cartolmania.it/file/xoxamiridapikapofilanoga.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/16751741800.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/17259215281.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/dupuwezikanofizivak.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109130724341471.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/64684187133.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3d40038defa95640507d5acda5957cd3/37219906980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=excel+all+formulas+list+pdfPDF 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_off0000c012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 16216 bytes
SHA-256: 5ea2e761071add813155b39e1d9b622bedaa0c784b7ace40779fb47215e9e967
font_02_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 10864 bytes
SHA-256: f18a159831844a306425654248c5991a8a806057bc57f914c7de0e5a31afd200

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