Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0f4f418cfe2c23…

MALICIOUS

PDF

84.6 KB Created: 2021-08-18 14:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0a2a8c8d87065df2e501506f30c0427 SHA-1: da3b529686c18d36c59395af06d63fd111087e4b SHA-256: 1a0f4f418cfe2c236c83b94e62b75ba0a8e424d168682463d978f99cf6e2d12d
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The PDF also features a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to distribute malicious content or phish for credentials. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4593

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cructi.ru/uplcv?utm_term=culturally+responsive+teaching+and+the+brain+chapter+5+summary PDF link annotation
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aef88fe96---94728788763.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/jebovavuxa.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/fonaseselibidu.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/mflua1k5j7fbeekmtqa8qjcev5/nakakazi.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/9146376015.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/pozubujefonaruwapiki.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/zawokedufekinoxelojove.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160740e92b7077---kuxugotovujotevopov.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e0bfdabaa8032d6aa5b781a85cc271da/94686217198.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/vusonob.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/18535216904.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af7cd77361---mixomajodoravobatugufu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffcc34e42a---rubijedenikamovewixep.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/weluzulepanusidomisuleli.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/64169430425.pdfIn PDF document text
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/70250761901.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021042913582673499.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/savixabijozatewaragewi.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1249a3b79e98255c8c9dc9865352a2c2/pigolekifaloxoferubase.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b62d31e0b---99710886150.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/zelete.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4c468c4e---2517491747.pdfIn PDF document text
    • https://tekartltd.com/upload/files/tejikiraz.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/xukefoniro.pdfIn 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_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 16920 bytes
SHA-256: 380e9f4377dc53a2a70a15a8629acf546081d9fc49751e0a3963ef3ad901a5b7
font_01_sfnt_off00012481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 11544 bytes
SHA-256: 45317ff7a35ef2cdcadebdf6a85b23263516250e9a3fe45640520a30150bc314