Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84d2abe0d94e10e…

MALICIOUS

PDF

100.6 KB Created: 2021-09-01 20:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e035c7098a9f8aa6a7cb191bf1b3b1ce SHA-1: fd81c414c28b8294259843cdc1d094afd0f1436f SHA-256: e84d2abe0d94e10e9c934c6bf32276dfb97b616f1fae7c94416a4a0311c89d5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, 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 document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://braciszewska-klimek.pl/fck_files/file/pidurejarofunakugowezibad.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/2ei6i4qppu0da97pmcp360l671/donunemobega.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/tujowunolerarisiwuzapota.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/eaca600993e906a8795aa70eeeab9689/gepixajadejobobutax.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/lodibiwafokaxepira.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/33508081871.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/gogixenafejafowo.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/rofowatade.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874e5e43897---34008382370.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/2ka6sq0prgq45vbq20k4f30qv0/12203470414.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/dijilituzuzexo.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/h3jnecvl0jm28nkc38ho258bek/mimawivetemefideripesodup.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c8919d1c---fobapedibefel.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c33c4b4a924---73262753084.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e0df49b07---76318995556.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/duxilavawowosefivosutubuk.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/33042775942.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/xapimudiwugumavoza.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/20930921472.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/bexedojaziwuzom.pdfIn PDF document text
    • http://orrizon.ru/images/file/nuwoninevamixelivojo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5613b531d---meripa.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/serafupuneto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=allusions+in+tv+shows+quotesPDF 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_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 10320 bytes
SHA-256: ebb8506d0827dc957fb7c3118663ab75898cb8f1c70c2a30c104dbc950e65f01
font_01_sfnt_off000136dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 20236 bytes
SHA-256: 3eed16491bc66a1a251a890de3f399a5f56647dbd27a91d110afd303c9e38806
font_02_sfnt_off00016b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1