Malicious PDF — malware analysis report

Static analysis result for SHA-256 69779ddcf0f330c9…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 23:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 86ce5f7a84b562ca2448ccf12e604112 SHA-1: 3c174466708f054ece8e38445c24561a9e9bdd2a SHA-256: 69779ddcf0f330c922f11ff8ebc34347d8446971e040da116ce83ff3dbdde2d6
164 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, several of which point to compromised WordPress upload directories, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download' button lure further supports the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ztkammer.at/uploads/file/sunuragizo.pdf In PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/zakawixobezew.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/luvedekagukedorivapamonof.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/zugowo.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/xikupijopanazifivelu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502065806384320.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b009288b9b5---roravojifu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd4e6bb4f9---ketid.pdfIn PDF document text
    • http://renovator.cz/files/file/73578959938.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/l9dvm7qopktuqf50asi2lkv152/26653109135.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/77165047174.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160caffd3d9a36---47283558155.pdfIn PDF document text
    • http://museeducuir.org/upload/files/tixurejesujudi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957a1bd92f4---dujofedukawavisuvefib.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/94542606452.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abf46daf508---89959244292.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/1efe6b91c24e3d926b84304ac7ec69cd/vekenenubomedefis.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/rerukoduworefunuz.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/xososivagorejogiwexeram.pdfIn PDF document text
    • http://mosjob.ru/images/file/20089801408.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/zorisez.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/poman.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf601f24832---44256165042.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/49834256413.pdfIn PDF document text
    • http://kag.fr/userfiles/file/8412366136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+ilspy+for+windows+10PDF link annotation
    • 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_off0000bde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 15884 bytes
SHA-256: 4e0f424fcea0e81d7e79d1ad8c1b189ce9f551032a910c8abc4d3f8f7a71471a
font_02_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 10636 bytes
SHA-256: 4ef034e3dabe4403551b166c76685aed4d71cb99c91397604633c92e5fff6d5c