Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f19ccadfc205bf6…

MALICIOUS

PDF

87.5 KB Created: 2021-07-02 18:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 917d319b0c745c485330c8de01a16bed SHA-1: 45af8cf4d320692ef13022629ba0ce69c6506eb3 SHA-256: 9f19ccadfc205bf6e17023cb3f39709e738ce9d013aec4f44237166f24f13ae7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage, likely designed to redirect users to malicious sites. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3347c928d---mulutefexej.pdf In PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe4dfqp6l9ih0nsv2oc0jcjvph/32434399964.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf265318b2---sobaf.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0f5448ab06a6f4577b8af92b38a4c4af/sisejibexinegatefapaf.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/b53fd09bc8a0734672619c607bf92764/jugatujove.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/dituforelapupupobekaxido.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/webexaxedigugi.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5bd0a1a7520c58da73905c47c985589d/debitivoriremoj.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/95175955328.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/zufanumuxi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7pf9u7p5vmjbu06nnmd3oe7ip4/90555535657.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750ae3e0006---kowakezudop.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/6ac26f0a7afb96a7df4620d3944e8a78/89483742845.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/fdd839f67d040fe230cde473a7f8d4fd/fikazolexaperiwil.pdfIn PDF document text
    • http://yuha.be/_files/file/kiboxejekegaparikoregev.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a2bced95---96829286404.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daae88ac4b0---35572660402.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/25010474354.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c0f719194---33531794458.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070445360e61---neragefakabefusux.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/917d4a602279e107e7036e75d87c1548/sirazogeveden.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/52421011338.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/judisonimeludid.pdfIn PDF document text
    • http://npas.ru/pic/file/9628981966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=2.2+pounds+in+kgPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878ddfa0a29---6854013522.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_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 10308 bytes
SHA-256: eea8ff0781037299ca50d3b18cd6d507525c0c483ec1fad9e6572ae18eb87444
font_01_sfnt_off00010b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B79 16940 bytes
SHA-256: 94877d3327b4193f467880a9e77cfc457af8a4d9b46b0cc0be818090ea1c6a92
font_02_sfnt_off00013769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1