Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b859fb53e92cade…

MALICIOUS

PDF

83.2 KB Created: 2021-08-17 20:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc683ea7cf4a63e487930b8b0d1e3880 SHA-1: bba140e1cc89fe918813750d88d438c29873ba09 SHA-256: 3b859fb53e92cade576f448082fd3e115700c03acadce93091adc8a25b477b80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites utilizing the 'formcraft' plugin for file uploads. These links appear to form a link farm designed to redirect users, likely for phishing or to download further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f60dc15a38---leworolexugomato.pdf
    • http://www.cbs-emballages.com/upload/file/pisepepadugosekexukukinab.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d74e1c81d---dibulurolop.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d961c4e4---tarewepogipubuzuborexagu.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/470f486eeeb15a0596fe5e851fa38c8f/tituwunokugigifalupi.pdf
    • https://pasarangroup1.com/contents/files/wanowatojotijisuzub.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbab9b71cc---gekefajatevutomojarizedo.pdf
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/1068669627.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b23d659e163d760d264e3ed5e316ed55/pokedu.pdf
    • http://thedreaminitiative.org/Content/Admin/uploads/files/fuwanorusimosemo.pdf
    • http://cuatudongnhatrang.com/uploads/files/pakaxesinuwewesizixuzad.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/68278080795.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210802035056888037j68shi.pdf
    • http://divorce-difficile.fr/userfiles/file/vovibegis.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100940df04d6---nedotifesadelanifunatuvo.pdf
    • https://cortemadera.com/wysiwygfiles/file/15363058459.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609227331156f---gojudogobamipariduze.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863e5a49354---fubopunez.pdf
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/30400334775.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7e1080d7d---89211833596.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca492ea7c6---zumuvuviravatisudagu.pdf
    • https://werbemittelag.ch/upload/file/25870124873.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/9315184fcbe86b4f3f36be5ea95cefaf/tobixenajozobaxib.pdf
    • https://zivotzaokny.eu/res/file/59498838168.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+meaning+of+death+be+not+proud+by+john+donne
    • 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_off0000e179.bin
8aa7a66191871ddade1d952ff832b25eb35411e1a76b0c7e1880af9d461ef828
pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 11376 bytes
font_01_sfnt_off0000fbaa.bin
c081e8840c37d2542260e33931d0eb0a4ce8d002dcb637414c7789f37a00026f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 16520 bytes
font_02_sfnt_off00012680.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12680 16792 bytes