Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fd9a4af4122440…

MALICIOUS

PDF

80.1 KB Created: 2021-08-27 15:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3a125ecdbc98fef334ccf173329f82b5 SHA-1: deace525fd1abd97a441aa32c23a479c126d9d2e SHA-256: 53fd9a4af41224408ace0afd34cdaf94964bda3ccc184a9e2ce102459d5c3dc0
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/buzifomesupupopaf.pdf In PDF document text
    • http://kaies.net/upfiles/21070810091493825882fsca.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/16287678088293731972.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/32662506613.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/pawigixekamuv.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/54157786022.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac1f7491ca---51041707125.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/wivezatidejusozive.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609797cf24894---19357647091.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/i5o59bj795hgdtd2lesr62vqt9/84698617242.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086a84375d83---vijezatedepuzufuwapaguf.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/xulubadalowaxewalegig.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/tonenur.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/mabawawabipevexaj.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202108161638255340.pdfIn PDF document text
    • http://edisonprivateschool.com/cote_dor_import/admin/ckfinder/userfiles/files/laronemejuxa.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edfff86011---64301194975.pdfIn PDF document text
    • https://loctra.net/userfiles/file/12649523196.pdfIn PDF document text
    • https://argumentua.com/i/file/28849872129.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/gipezezavolakaf.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a80360723fe---68878885201.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/venapolibepamojimasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=demonstrative+pronoun+exercises+with+answersPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/24c8b5fde0e6f2ccbd3f1f2870e389ea/javusimima.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_off0000d1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 17972 bytes
SHA-256: 67795a2efef9f4a606618a8c8eca5ce02136d9030c319963ae389a6d1ab53f28
font_02_sfnt_off0001187f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187F 10948 bytes
SHA-256: 9f4f451acc6e80db89e3de9f7e51db4927ff5e0c6410a23968da6ee97539786d

Open this report in the interactive analyzer, or submit your own file for analysis.