Malicious PDF — malware analysis report

Static analysis result for SHA-256 c581129ba42f67d3…

MALICIOUS

PDF

87.7 KB Created: 2021-08-03 10:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c6f442fdc3e897c9bd751e313b5e9968 SHA-1: 247fc66a29f724bbbf66fe1ec0c105a24787ee27 SHA-256: c581129ba42f67d3e331fc4d74bc3a9adf0b41c5ad1e89b15a31e37c060ca44e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links to PDF files on various domains points to a link farm designed to redirect users to potentially harmful content.

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 https://chcial.ru/uplcv?utm_term=how+to+pass+the+vision+test+at+the+dmv PDF link annotation
    • https://asiajitu.com/contents//files/8869242228.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/51059536440.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/85468216163.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210708_DDD2BA3283EBCB59.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/agvkacimathliiimt8kpmja4n3/zumiwarefarekelujizuze.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774bf249d41---64337753533.pdfIn PDF document text
    • http://jucal.es/images/file/tatuluta.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/10983067976.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2f2f04de---4348914394.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/55240418ffaab23b02266e8d0004e984/97006597382.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/lasujefafupigaginusenomak.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72b4a0fca---80319342960.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/41044068991.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/91cbedf43377400ca7073e396d884c24/11248690446.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9b422aceef55d4c2db0feb26252faa13/lararumexin.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/73d404e40d17eed76b5ac929e7b6f94e/jafemevimerefodemi.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5a2e9dd9615f7e70cd88d38370aa2664/josebufamujixibipaxadere.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/cff5c6c234a4f6e432b83e7b7d2ad982/rakuzarom.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c9059146---jorideli.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/88661278600.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/67df363cc851674dafe98266d3f2a1dc/jikozazakosalo.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/lopefelemezuvasunajup.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/jefeburazizomonipuf.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608540f64d9d6---sekuwula.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_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 10656 bytes
SHA-256: 5c1973eec71739f626a5eaf42f3c28a0b124d1263df8a5592547b64ba00d71b4
font_01_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 16892 bytes
SHA-256: 86329465b9132832f8901a058193ea506e8c67d0eee17dc9e1867dcd083c2b67
font_02_sfnt_off0001371c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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