Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8046f866d3a6af4…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 11:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55c3756490616b2119d6afc2146c8ad6 SHA-1: 34c9aff6ad9f6f9085c8497c30cc04ef9bd477f2 SHA-256: e8046f866d3a6af417d6babb17d10334e466f4b4ac3df1d6cbb587344ebbc579
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=shareit+download+apk+app PDF link annotation
    • https://psfund.org/public/uploads/files/cms_files/72968893342.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/rexejedazujigelosanisoju.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/zofaxigolegenadofijivog.pdfIn PDF document text
    • http://rs-entp.com/upload/file/guwepixavabadu.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/lagogesukorirozopamijo.pdfIn PDF document text
    • https://alev.az/userfiles/file/72292753931.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/lusitidagukisamux.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faadde1937---fuladorige.pdfIn PDF document text
    • http://m2m2design.com/userfiles/gobekudusinonowoso.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/sitirufovenodiwemiranu.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/babaki.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/livokawerezusijiku.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/44035510384.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/61661393921.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/6034054823.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/kukimudatofefibewuxarinam.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/maguvarokek.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9bdcc6fc---kiluwunogagamojufepalefu.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///nilalabevalirizo.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/povude.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132612225e57---motigedozivajogibo.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210904154854.pdfIn PDF document text
    • 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_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 10576 bytes
SHA-256: f3728fbfafcc97213634142bd2b33913aee9aa8088ab19ebfa0a2c51246ab0a9
font_02_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 17324 bytes
SHA-256: 883043f8e81cda670656c67b2873d09db49aa7f691743914c968d47cb6a48b6b