Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bde76cf4ef9c4f2…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 15:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df21a4a2c9f5115f9e4a827ac84eb870 SHA-1: 5812082297fb7514b2e5f14b4eec12bae4cecb67 SHA-256: 0bde76cf4ef9c4f218c752256d1890ec6afb91fa882580129524e3a3bdd1a071
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the heuristics strongly indicate the PDF's purpose is to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=similar+and+congruent+triangles+worksheet+pdf PDF link annotation
    • https://adamant54.ru/userfiles/files/15838946030.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084f42f99eec---20748709860.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/fipuxuxeranufakapi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210715170228141.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b168635041b---564907494.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6796b646---konagoparepemixonifitetit.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/nejosudebasumexisose.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c11b7a8f66626bebae938d0eb35665a8/tovibile.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/giwagedobitubizititiputeb.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/negebizufusotojegaji.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/nadijanerukigenuforekafu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161092fcdd39db---bonupojadowinu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/fcbd3cd6e186a9a35c9f64b6259e62ef/77553777967.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cpsepfplgt8q7cfhli2q5gt13r/29622684538.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/64ffa9eb6a92d8df74a24a5e6dd71db0/gumujamogafikewubok.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/zanuzapoduloparivufedenak.pdfIn PDF document text
    • http://biomehl.com/images/content/files/pexatebujaronep.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/64098697472.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/90545468472.pdfIn PDF document text
    • http://industrialdevices.in/uploads/24309418280.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba277ded60---nalidumomajadel.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h2csu61ssu7i8d73lbk28ft1a2/56280148068.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_off0000b9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EF 17652 bytes
SHA-256: d347a4c72a7419285b2f2e6fa1976d6df55901a83246ec63bbff295183abaa16
font_01_sfnt_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 11420 bytes
SHA-256: c1b433374d4454d62dcd28b31e15e286306ea02d718030fb125e610f7080a8d6

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