Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65519cafc43caa7…

MALICIOUS

PDF

89.8 KB Created: 2021-07-02 14:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c34f832ef4b4ba0c48e043c088ab4e3 SHA-1: 8c86e219ce793625b9de8758bd11f358a027c8bc SHA-256: e65519cafc43caa7e4200677894faaf654d65dc48150e546b7f5dd00819628a9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609862a3ccb4a---78116953267.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s5f1efoqqlva5peoovcetrg7s2/24508657330.pdf
    • https://careersourceokaloosawalton.com/files/public/72256275091.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3655e3caf---62767426708.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/5f5973juqq9ckmht4eo9fceu15/42667937834.pdf
    • http://nomaquito-travel.com/editor-images/vixerenisetojes.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a2cd818f7---jetazo.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/557a78f4c9d22fff39c183b71059cf67/98130925696.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/2485ff6f43daba75b39b1fbe9abf4ff6/54939671182.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bfcb6389---fuduwasiwogot.pdf
    • https://muzeumkonstancina.pl/attachments/file/zaduxixofexutovoxubage.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/dgddhe7p7359aa77m6rpimurh5/49726111853.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6f8d4457---80510436404.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e65dbb928b---23936554324.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/mujobusezizilewevifop.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/pozoxutidegutog.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b185e78009e---gerofe.pdf
    • https://palezieux.com/ckfinder/userfiles/files/61547997354.pdf
    • http://yossy.biz/userfiles/file/54813097344.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afff93e3ac5---2220088342.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdce0b02db7---66258369460.pdf
    • https://bselink.com/userfiles/file/22843125498.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=3ds+emulator+on+iphone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fabd.bin
f895dcec4c8ba6d9782d9b6152621de706266d1ab38213a1dd81884a9c2412af
pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 17768 bytes
font_01_sfnt_off00012909.bin
a073cc202fc4533710d7529195a1311d2273eafd7d640f819d177e5e54908eba
pdf-font-stream PDF embedded font (sfnt) at offset 0x12909 10832 bytes
font_02_sfnt_off000141cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141CC 16792 bytes