Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcbc65abf6a42e1…

MALICIOUS

PDF

122.9 KB Created: 2021-07-13 19:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 517c41aad00a0000a13ebfa3f20dacf3 SHA-1: 4478482bf3d0a7f12d6f648a531451c0eee81074 SHA-256: ebcbc65abf6a42e1d865c3c990475bb79414bc0826817bd8f28cd19f8d500def
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The file's structure and numerous external links are indicative of a link farm used for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9651

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://chcial.ru/uplcv?utm_term=obliged+meaning+in+english PDF link annotation
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d9145a27---bomarunefirubelu.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/nijikuxu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/u2oqft69c8mru9qf4ajsom6u76/wonezopuwerubifa.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3572574198.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/43336951622.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/93815019085.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e9370083af5b85f94b775678928d3c9b/2153853825.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/116284c4366b95c9c03b7a52747580c7/22804549131.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/1122166483.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/ligomekeda.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a259bc08084---jemofososebumur.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16077088fdd686---judopolekanediritodasu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b0da2c72---kavabe.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/23851783656.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/18d81ca9763c793f0a7268122891fc7a/kudewebidul.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f22beafedc---muzabosejimadaloba.pdfIn PDF document text
    • https://people11people.gr/uploads/File/24642195690.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f1a36c41---gebutafaparafikewipal.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/oq0f7o7ffdfakevqv534re5326/nuvezeduzazowupebijalasej.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df99122aac8---65439098765.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/kv4c4e6fdtgcj7qjhcl2oj4seq/fupod.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/genufesefusimode.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/18593913201.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001a737.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A737 26940 bytes
SHA-256: 8a0cbb8e78fcb108559a2981f31ddd69e8ee1bdf63b27516201359788697cf2a
font_00_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 10848 bytes
SHA-256: 5e365a460f857689bd433356e20cc4e9b0970853d11efee1ff129a4c8035b96e
font_01_sfnt_off000127e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E1 35324 bytes
SHA-256: 78591807f7b216f90fcc5bd278684dd2a86def47106977f7b4b414421c9ec0da
font_02_sfnt_off0001778d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1778D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FA4 10544 bytes
SHA-256: cee48091b07f21b9c6202aab11258fca412979bac3c8b2068011a928952df038

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