Malicious PDF — malware analysis report

Static analysis result for SHA-256 e495f5227987da93…

MALICIOUS

PDF

91.1 KB Created: 2021-09-06 23:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 43fd8989d78bdc20fd32dd4a25aae417 SHA-1: 26cb2ed2a991cb1c765b51133530e6a76b4dad57 SHA-256: e495f5227987da93977e350f4ab7d58e1e37db0c68b9a0dbd64f5fb6f0de606d
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 PDF link farm, with multiple URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/fdb5279471c4b86a4efa784877b1f2eb/wexinez.pdf In PDF document text
    • http://ankurgroups.com/userfiles/file/85023380643.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/73303292903.pdfIn PDF document text
    • http://teakdeck.pl/files/file/bonokemomep.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/duvikajezananonudutuwum.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/zowinuguvulerodeko.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16114f72697510---83132808859.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/nejokarut.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/zavofetupuxuvimowubir.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0a4hqjvoefl1ei73ejcdu79jg6/bozoxojuxilajopa.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ea9db1a515bc52cdc82e6d0c0d42338a/91691574770.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e004a2a28a8bd17e37ab25ca67855cd1/gazodolizuso.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160745f276ca15---gaketagubotilegeke.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/3911549876.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ec42ba2e245---88310513293.pdfIn PDF document text
    • http://konberdbio.com/upload/files/69931055441.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16124a5f056ba1---xarobadag.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/57b0jgm0aedph450a5kmrirnn1/58914951078.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/dupefupojidanagosobijuror.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/duzubu.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/beroduv.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/43006497106.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/40096810164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=geeraar+amaan+ah+pdfPDF 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_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 10280 bytes
SHA-256: 2845c0ed5b62f511662e124917ee53cc9cbb363ac7a9375f9298bc3b81372748
font_02_sfnt_off00013096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 18336 bytes
SHA-256: aaab89845d79dbed8c83f4d3b792ccf70b57c7c03b48f6fa32289fdeb76cab19

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