Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b474e80a095bde…

MALICIOUS

PDF

80.2 KB Created: 2021-08-25 12:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdd68fe188290799c08d8ce9c7a918c2 SHA-1: 9625c6fb73a2c69a4d061efa7b85646b3217c1c3 SHA-256: 79b474e80a095bde8dafc5ebc3fff641854a420b7e0847dfcbab365a3981055f
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to various websites, including those hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm characteristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://queure.ru/uplcv?utm_term=aries+daily+horoscope+astrology
    • http://solee.cn/ckfinder/userfiles/files/19326097517.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/u6f5qvn3o9a6prb9bgoqe1lnj0/12754927656.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fe72b34e0---butewa.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ef40056c0---kubatubud.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5711ce6e9---14638849328.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa714165a4---jedutagedoxo.pdf
    • http://kd-council.com/upfile/files/powidilisumumedozut.pdf
    • http://ainut.fi/userfiles/file/feriteku.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b737a2ec3b7---fazexifumexotu.pdf
    • https://jeneifogaszat.hu/cikkdata/files/jukud.pdf
    • http://michellesmithscott.com/clients/36670/File/buzixejazafawijijazeza.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/8a438d37fb96ccdea71ade502bae788a/19457577273.pdf
    • http://akkoryazilim.com/userfiles/file/gemomoderibeboberile.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/32358260075.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/64ee3511141b53f956f25020ec8cb7d2/67238485345.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/35400071395.pdf
    • http://cottoneauto.it/userfiles/files/tefezimiwibamulu.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/vazanisabodaxunojet.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160771819c6c5c---josexanovotelepov.pdf
    • https://adian.eus/files/galeria/files/95547191228.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_off0000d758.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 16792 bytes
font_01_sfnt_off0000ef6a.bin
c239663dddd7c1e10fe173bdb15dd563ed8b3230bb40406c81829731908edaf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 16240 bytes
font_02_sfnt_off00011964.bin
10a6bdbff403e8f5f2f6fe8febff3ca9631de7a18a30bc87d75bf96a0bfcfb93
pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 10784 bytes