Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ee2d00b614a66b…

MALICIOUS

PDF

84.1 KB Created: 2021-08-22 02:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d2cef0f4e5746d783046c3806509a2f SHA-1: 2c6f3fbb1b4e660c07f309baf1a1e250f81d4d2b SHA-256: 91ee2d00b614a66b0e837edbbabf53445a5eb91f671666d53327f1d9a43644f0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm and a callback phishing lure, as indicated by multiple heuristics and the ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous URLs hosted on compromised CMS uploads and disposable hosting suggests an attempt to redirect users to malicious content or phishing sites. The primary attack pattern is a callback phishing lure, aiming to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160810e6950458---50658508062.pdf In PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/vvi1djl7un0iars2p94dmlqqi1/13982099935.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160cd32c636289---rojidujoxunojenufagerex.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/bonasinekip.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff5b22635---72708932865.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/dabekabiledu.pdfIn PDF document text
    • http://terminsk.by/pics/files/mobirabakudo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64c1cab90c---98235416168.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/kejijumanarakafileda.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/fikuvikarepamemajovalesi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e606ce558d---mokafowixi.pdfIn PDF document text
    • http://primaneighbors.com/userimages/tadapar.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/12418113709.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/33918225692.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1352f95775114c1f2358cd608014b48b/38852759165.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/2545747238.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/11371405984.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/vurokegevagapigilop.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/nezujozuvurobuv.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/56775619361.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f61f3f113e---fakekofutoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+online+casino+no+deposit+bonus+codes+2020PDF 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_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 10944 bytes
SHA-256: a975defd38b08cde35beed6d4e59d2da37957948e8c2fd306c724bfde172a759
font_01_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 17832 bytes
SHA-256: 9abd866f008259b95fe61ae95254c4cad1600c56e4faec1cc4a4a013fafc702a
font_02_sfnt_off00012afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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