Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14a2889fe2f2db0…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 04:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7d89c149d45f91e57300b8744a3b3d6 SHA-1: 94be928fdf56d4d1b1c7f97ac2dfa04e1634f385 SHA-256: c14a2889fe2f2db06684c2acfc44855b1f23cee01adf230046612d88433b9d65
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, many of which are compromised WordPress upload directories. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to download further content. The document body is unreadable, but the heuristics indicate a callback lure pattern, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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 https://archism.ru/uplcv?utm_term=emergency+hq+apk+download PDF link annotation
    • http://assytekservizi.com/userfiles/files/52555118995.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64253942163.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/20612398964.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/livaf.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/rezofujenetuvef.pdfIn PDF document text
    • http://climtech.com/files/files/begebajenezamidita.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c3220ac3---sodazetadevigevobuwutig.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/giwewepujafekunobawobavaw.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/wovewamulavimotelu.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/36053388794.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/nobetuzukifidasogoxuxawi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182a55ca5e---zanexajapazad.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450fa0d89c4---newilataremaje.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/94706091555.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/19399587681.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/pudawoz.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/28317869288.pdfIn PDF document text
    • http://seto.cz/uploads/xirat.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/64154187255.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/42812598179.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/98230898085.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/39921180810.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/45447259178.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_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 17656 bytes
SHA-256: 01a42166da04ec2c64fff07dfb6818f2c8b3ac185ce6f541fc06a633ca1076c1
font_01_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 11024 bytes
SHA-256: 04b10befd87729dca19ad28d0751358a1c8e47b795c07b06fa78b9d29843dbdc
font_02_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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