Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73a10d8ba168108…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 02:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 284633d71845e647bb3f42af431d4a7f SHA-1: aa79dcc9b25c9f45c5e1f312703090a01c2cdff1 SHA-256: f73a10d8ba16810879462cf883dd8f4718afd3b92a3e065ba7007552a865a11b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories and disposable hosting, suggesting an attempt to obscure the final destination. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://topas.lt/userfiles/file/natojuvoredaturimoli.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086ceb598d5f---62161675495.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b80df1589ba73c9833fc60423a393073/89715061720.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/42943829735.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/43478072147.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/mifipimotetejuviliw.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607368ae1e0a1---wavebebaguridisokebon.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/ridusedinaxaruletesud.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfd85550d---kufetuzutusutaxuguvesugif.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/mawuzisubuvuxesarusipup.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/48ab8ad08a0e7ecd88656c130d19a720/36068111716.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/96e426b3d19b91760e47776a9239439b/radonuvusinogov.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e3d56e3a56e90a93a56aecdcfcc620c0/35175857493.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mha20vt1o4a9civetkov476lb6/33046777354.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/15401389402e5f4bca45bc58fe36e54c/nedaxe.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1a311d0fd6e13ddf3a165cb8e692f356/zadejoketulewesav.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861f3d4e802---55133503809.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/suxomirinigok.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a81ac5c318ff734083f80d9f46400edd/38797588420.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/rimaruvele.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5abfc82345---nunefujakuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=multiple+digit+additionPDF 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_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 19784 bytes
SHA-256: 704d9d3f93cf133e026a94677da60d33040925085fb21d26874f5b44084e4d1b
font_02_sfnt_off0001369b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369B 10392 bytes
SHA-256: 926c17e0708454ad3980b2cca3a42d392778a578be011822d05c66c8f8d58f97

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