Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa4e20dc725dae4…

MALICIOUS

PDF

88.7 KB Created: 2021-06-27 00:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db53cbb1ebc935f8be3054300dcf6a85 SHA-1: 52329e447ad43f7a29ca8aaf2c26f2f165053ab5 SHA-256: ffa4e20dc725dae4011cdcc296461cdc11f28cd46f012de8985f1d9924b3e5da
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload functionalities. These links likely serve as a distribution point for further malicious content. The ML classifier strongly indicated maliciousness, and the presence of link farms on disposable hosting further supports a malicious intent to distribute harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa4aa7ee3---vigupomasuzegume.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90e0bcbf61---49141983854.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aca89b319---wosevefujabiwe.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b54b8880054---juxuvin.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/861e56e704f36514301dfb81572bbf32/58900388646.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8nimnrclv49djub3bs80ejhmqr/niwibaxatebutogisozizakaz.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3492806263ad2fec2703e40078d76408/54968030924.pdf
    • http://bioident.pl/photos_fck/file/sutebakobazusunisisijojot.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090a4b4592ba---gufotivizididu.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160903fb35b7e6---gukojoxitisi.pdf
    • https://salvatoredivilio.it/userfiles/file/nalajexenakisivuwo.pdf
    • http://terezmisszio.eu/files/file/67330195684.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/daafa19336a3896d8c02d3aea232887a/gitutuminexiwus.pdf
    • http://nakatka.com/files/file/80881607387.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/lr0pjm3adflhppp758m4jkkmja/15118854089.pdf
    • http://softwarefactory.nl/images/file/31762105905.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/44525320563.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c0387d5e---pojebaxiwa.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/53e53187fa2d3f9d2bc01de100b27ab2/sukufazixasev.pdf
    • http://serramentisiciliano.it/userfiles/files/rokovonuxe.pdf
    • https://bem-sa.com/img/file/90774436242.pdf
    • https://indobaliart.com/sitefiles/file/mafemugolutaliwixo.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/31592873276.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a9766e580---64867752331.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e669636b1d---womuxarelinoru.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=face+unlock+android+10+apk
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5b.bin
4b9f1f23ee2682cd83f15680cc9635999b2209a94cb81693debf334b4c853d18
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 10584 bytes
font_01_sfnt_off00010487.bin
fa7ddfb8646d04af6d07ae6072f41b2dba7acf44d194120e5389a821d3fb3866
pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 28532 bytes
font_02_sfnt_off00013dc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC2 16792 bytes