Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdf75635944e119…

MALICIOUS

PDF

90.6 KB Created: 2021-07-03 13:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ed13b2d240bddd3fa6ef1cd5c6b2fbc SHA-1: 154738a740a043a40ed37f2c20ff940f08f4dab5 SHA-256: 8fdf75635944e119d9b1f3d6aa1949c3de90f2d775749252d969937050879f14
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03011d6a03---wizolisereno.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/dutopelumilupenu.pdf
    • http://samafb.org/uploadfilefiles/pudunometibubix.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608444983fc65---nilalanil.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/aa58182b05ced5b80bfd2e2aed8ebf27/lizepekifefefajum.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa52203391---gepakobonamexuwagojogupo.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/jigivozewojuwofosuf.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/zifunudisazalorit.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/np7bjtcnt7ept8u3gbn8v40jrd/64957998212.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/f73790df408a6525234a992aec830935/kedudinezamigogakekipufev.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/v81ni9uqbtsk18r0o979ua8uk2/37558880262.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd423b1e5---bejowijepi.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6290f142c---29956589804.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abb66794337---lufadujazejobi.pdf
    • http://watch62.ru/files/files/81572747013.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/76a4a0b3a4c072fd5341987ff0744bdf/54603987874.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88587b68b0---motexumun.pdf
    • http://al-bandak.com/userfiles/file/3631240501.pdf
    • http://movementlab.dk/userfiles/file/difagogimemetaroku.pdf
    • http://caigeshi.com/uploadfile/file/2021061718204073499.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb35d86e6---solepuroj.pdf
    • https://an-professional.ru/img/files/file/dapoved.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hot+flashes+and+heart+palpitations+at+night
    • 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_off0000ffb3.bin
7e45e5fb32e07da705f5396517197414c543c579bce8f7fd8f1ed1f2f8c898df
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 10768 bytes
font_01_sfnt_off00011820.bin
a0591d953e5550859722ab2851468b66c7376faa2ad7c1b3a8ca97b4c599b53e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 17188 bytes
font_02_sfnt_off00014516.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14516 16792 bytes