Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b170d129c952899…

MALICIOUS

PDF

83.8 KB Created: 2021-07-09 15:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f705cdc4072e0d34b49b656dd6557c24 SHA-1: 78426ab1f9442879f5d0411c30cb1cd92b0f251d SHA-256: 4b170d129c952899711c3ac4020574ee38a87cc92506efdd124eb2aea7b159dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are WordPress installations hosting PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://adamlegal.com/userfiles/file/676164767.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a391709a---59941211363.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e0a2a9b99---75464889458.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160803eaa6d18b---vukokawanubezubewebolek.pdf
    • http://edgecs.net/documents/36840812570.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/duxilowajojekedika.pdf
    • https://abofahed.com/userfiles/file/fakinanojodomonukiwuj.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab617c3db5---girukabopelevawika.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607c1e726a17b---wivedis.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16097656786622---42118657756.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5913071b25---71881476826.pdf
    • http://toshiteriyakiburien.com/uploads/files/vanejikobibodenuxed.pdf
    • http://tuanlongland.com/upload/files/93947752409.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/748s3c5crp7kgt3kebdbd6us04/41756075750.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/2300946010.pdf
    • http://yishiweb.com/upfiles/files/20210602_001402.pdf
    • https://glearningsolutions.com/userfiles/files/48883094171.pdf
    • http://bestbuyfromindia.com/userfiles/file/zukuduvupabisita.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb869cf2fc---51652533248.pdf
    • https://motelandratecuci.ro/userfiles/file/disujaginavaxegawuxamifo.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f111a26cc0---26928433501.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1668e10a58---turinumowukunivujuxajug.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468f942e36---vemasosu.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0e10620a519bc94ed85c47253ca3c618/25918498170.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/77951929556.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=c+sharp+major+scale+bass+clef
    • 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_off0000e25e.bin
77062d273ead889b61bd83968597d75d527673fd5d21a21de7c746f011664dbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 10752 bytes
font_01_sfnt_off0000fae4.bin
2984509f58f28c49d3387c24b76734224f2118cb5f9d97f79d85338e4837cc9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 17896 bytes
font_02_sfnt_off0001299f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1299F 16792 bytes