Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5f23b63c54c121…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 04:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfee36fe055aa25464541168367fc604 SHA-1: 0e27c844032189ca20b00697a3063a8d25157e8a SHA-256: fa5f23b63c54c1216758af0e080dfa9167c71fe5c38140e836296bea26a13fa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms like WordPress. These links likely serve as a distribution mechanism for further malicious content or phishing attempts, aligning with the characteristics of a spearphishing attachment.

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 http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/os7dq8312vd674qef3ap9spnf7/wojovas.pdf In PDF document text
    • https://linhngapt.vn/upload/files/jozeponaveni.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/negukesuvelosilezak.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/70647314499.pdfIn PDF document text
    • https://yellowstonewildlife.com/sonogani.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e5c1d529d---36400277198.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/47073168128.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e76d6c0350---fuvigopuselan.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a573fd9b154---jovajorazewubute.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/33845394485.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/46910383557.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/58585122347.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/gexekejevikar.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/50046174540.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/62qtsug87b31rndnb6iio3pgmv/rixubazizugewulabubixaj.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/72296064994.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/26476497000.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/45baa06979de7cf14d2ed8130fc32030/22274582505.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160794a217c5f1---16641781145.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/73545669739.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/646d9aonpg44thbu06c8url22l/41494011927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=modicare+new+plan+2019+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC617 21296 bytes
SHA-256: c675084213e198dea30e772ff7ee7d71fff2eaa45d3849b56357048612ba5cc7
font_01_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 10888 bytes
SHA-256: 15ec1a81c9db9ab95ab26fc21eb3d0b12c75692bd90e659cb5fa73f24ca6eda7
font_03_sfnt_off00012e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E17 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5

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