Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd485ee9fda3bcc0…

MALICIOUS

PDF

89.9 KB Created: 2021-09-16 00:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3995fb39e37738923b5ace58f23fd6b SHA-1: 25790517367f50af92426c976817f65bb8436718 SHA-256: fd485ee9fda3bcc0cb5f64df221f4df5d38199f91d4515f531e67bd56d20240a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions, while the link farm serves to obscure the ultimate destination and increase the chances of a successful compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=edgar+allan+poe+the+house+of+usher+pdf PDF link annotation
    • http://ihdbd.org/upload/files/25970995878.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/vugetusuredomusinapu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/677e64fec11c529b9abe7a42a16e3b12/kosexunenoketabepunibixu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pefaribizidomejoga.pdfIn PDF document text
    • http://canadianrockies.info/files/file/junivimebunapib.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/1852283566.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/wexufudesafikawejupo.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/gotaruponokidimegaribilez.pdfIn PDF document text
    • http://feg.vn/uploads/files/29998521809.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/38951431880.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/37939960900.pdfIn PDF document text
    • http://cabini.it/userfiles/files/78057258513.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/22418c2a453bfbc352049b2e01175dfc/leteza.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/11958694339.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210915_213710.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd28e8cd4e---golumuri.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/50182418720.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6099c2d9bea640e5a2fca7b34401e92e/90061868699.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/jefikubupavowizamabofor.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/15729247935.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142698ec1bb5---xusiwezigomutamukelazasu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139851c71b4b---33520313948.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/38755278437.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d63eec293260df61a21dcc4965e7af3a/dezuko.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/80114498738.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/68597280356.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/rigosawo.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_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 10768 bytes
SHA-256: 2111f845f197b3809a5b63bcb0e347fab6c328c2ff27eb4b5104b144d71a39b3
font_01_sfnt_off000113e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E7 17872 bytes
SHA-256: 86f1bfd7e80d4dd0d2727b18ece31822c0269662005f37ce234061e660d78916
font_02_sfnt_off000141c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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