Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6e6eb950028f30…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 15:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32a8af91bdd88b53c8350b0f8ce8664e SHA-1: 592c345125a56efd500d57eca343d46716b07bde SHA-256: 9d6e6eb950028f307c352a4fbf050c148585563c6694806da00cd9120351a439
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to trick users into visiting malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://joyandwowbook.com/upload/file/woxefobeloxolaxatow.pdf In PDF document text
    • http://myjobcareer.net/userfiles/file/2021091523584673499.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a887ef01a0---dimowinotajefafejo.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/3516101346.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/81468385098.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/kuzikotu.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109050608243700.pdfIn PDF document text
    • http://screen.by/images/file/sapurofomaviwik.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/i18tt54fk510g6g628v8bi1hio/vafiwovotapivileso.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/wakivubomujurider.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/060420029288.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/86883614385.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/33682189779.pdfIn PDF document text
    • https://best-label.com/upload/files/27916738127.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/60820099244.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372807c6c74---54020752117.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/sefibasezusiwopezaporiruk.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/jelalugevenar.pdfIn PDF document text
    • https://uangraja.com/contents/files/wavipalapopoluwizagunire.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/xetofal.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/91919413938.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/97877535454.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08fd04d2b---1798264649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=iphone+12+vs+s20fePDF 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_off0000b3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 10268 bytes
SHA-256: e9d7aceaad10b49f96e159048c4ab281b1077c3369ff40efa4d1e49b30d657ef
font_02_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 14612 bytes
SHA-256: 6e727ead96e03707c20f911e19e5f48849a9cb0bd0e038c5b66735fd1c10f26d