Malicious PDF — malware analysis report

Static analysis result for SHA-256 1808f73abc8f1697…

MALICIOUS

PDF

129.2 KB Created: 2021-06-19 04:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 279a2903dec02a7afbf8db38f9fd9a58 SHA-1: 63c4c4a3022a5287a97d0150c9ce30c71e5dc582 SHA-256: 1808f73abc8f169771bdf22ef7f73c690f66ec0aa6723a57ef11d4359a0ebe93
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This behavior is indicative of a link farm, likely used for SEO poisoning or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25b34d55f---fanunetiziwidogisogoxetix.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/29d062d067b3bde9750171bee374c4d7/ridabalogiwafovif.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/23cd5c7f6e051410ba9f1c8c9ff55aea/nigejifaxebon.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021521212175213.pdf
    • https://batikatravels.com/userfiles/file/97091883775.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/4fcbc142c828147acaf7f386074b7a64/51481168928.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/86527545790.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/2876233356.pdf
    • https://peilimineko.com/userfiles/file/78852093913.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d135974b5---vuzazemogopudalefawuji.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/u80l1c0abgcjlmpc73g0lon7g3/gilawina.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4fkao6sn8j4rahumh3g37l27m3/71566740154.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c62eba9a712---2114073439.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b591ad0cf11---dukusufoganajuzapojutava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=safari+gujarati+magazine+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019845.bin
942e3b65a4204fe5c96f70d8aa1ade43991c5aefda177e28a44b5e1e77b8d965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19845 3880 bytes
font_01_sfnt_off0001a622.bin
95270f214c54c04e78e254d538544222c35f4874de00e5be0bc039ce2de30804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A622 5380 bytes
font_02_sfnt_off0001b86d.bin
9f63ccdee979bfd21f6c0f06d8921c1f7dc4d7163ed9afaeb3e9c373a862c673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B86D 12768 bytes
font_03_sfnt_off0001e213.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E213 16092 bytes

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