Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf554fc250d148c…

MALICIOUS

PDF

85.5 KB Created: 2021-07-02 04:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6ee1d926c500a733d002eb7412af704 SHA-1: acc4639946c5743c5c131bf747bcd85a54f53b1f SHA-256: daf554fc250d148c92e78ea3775685f8f082499cdc6d979ba1758fcb7b8c43d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns that leverage document lures to redirect users to malicious sites. No scripts were extracted, but the extensive use of external links points to a downloader or phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=free+software+for+conversion+of+pdf+to+excel
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bafobalepetolupukixid.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c78c4b0bc---zatemunasiv.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/oja8je2pguv89hpaqdmstkp9j8/posiwarawivagibonibexe.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2830b67547---68367493303.pdf
    • http://mobilesamara.com/img/files/file/devareluxujiginavo.pdf
    • http://csptech.net/admin/userfiles/file/77803819676.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a817df175fb---rosumamekawufutasolur.pdf
    • http://sillajen.com/fckeditor/_upload/file/2023287566.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3e380e3f1a59aeafd8958d7a996aee57/natevadidokesitebo.pdf
    • https://geneticapanama.com/userfiles/file/zadudomizerobem.pdf
    • http://wsm.hk/images/uploadfiles/file/59038560915.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c1e6c2685---duboponisugu.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1561111525---65154169769.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa4081c4fb---46063619493.pdf
    • http://bclgrouptt.com/userfiles/file/nakobebugapumifo.pdf
    • https://fcr-fomentoconsumoerenda.com/uploads/files/kulipavubefox.pdf
    • http://atomleasing.ru/media/File/xutewefatorijizigepuna.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b86dd1a1b1d---saxitogakipotamilabewatow.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e322269520---83240567130.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b571dc75574---65805483242.pdf
    • http://novichiha.ru/pic/file/bever.pdf
    • http://amandatravel.com/userfiles/file/4173201118.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbe7dd70fd---revuzire.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 16792 bytes
font_01_sfnt_off0001045a.bin
31b6da0d38262bd24863e16ba2b056e9bb49ea12db5a832e5217fe7767a2df88
pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 10844 bytes
font_02_sfnt_off00011d9b.bin
1e0544a60525863ee2cbd0fb02662e2119c46e32774774338fd80e148c0b74a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 16636 bytes