Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0bae70f415a6c1…

MALICIOUS

PDF

81.8 KB Created: 2021-08-15 10:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd48e7ea6d3f45a66e6a5ba642923f96 SHA-1: 3eebdf0ca7eecc08d3cc0df79cbcc5613df3b585 SHA-256: 2d0bae70f415a6c1e89ba04246408ee81550aa4a556050454dcadbf2a300549f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cremyco.com/app/webroot/docs/file/90102338668.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084181bc0fdd---gikeduzirigudagurewok.pdf
    • http://suncitygroup.ir/basefile/suncitygroupir/files/98136582576.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/novakapow.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/17e9b7404103bd1ead11f841d4f2cb84/vitivuninoviwor.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/82188677903.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fe44b22ba---72109835591.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cae27fb3dc5311163487ab927cf99a69/lisaremuzafobu.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-4/20210504075657291919.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b90f7f01d---dedulamirapefunofikoxerus.pdf
    • https://dichvuketoanvn.org/uploads/files/7258179275.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf1ca82010---xepivofebapaxod.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/67524754192.pdf
    • http://jrpst.pl/userfiles/file/13230708.pdf
    • https://digireg.se/upload/xizowosisinejer.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160741f136c9fa---27646075593.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16095589c76d17---29106039885.pdf
    • http://targdenunti.ro/userfiles/file/degudozoxiwazinorix.pdf
    • http://cen7dias.es/userfiles/files/fazor.pdf
    • http://marasintl.com/public/ckfinderuploads/files/joreweza.pdf
    • http://zentrumok.com/userfile/files/10354738612.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6d5d17531a19285c402b63a08d7da3f4/86942899081.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/069i6vk9ebh4dbfppbpnvhkb84/nimun.pdf
    • http://lt101shop.com/userfiles/files/punareganegebatobuw.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adaae70e8d---17363558684.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cuisinart+food+processor+dlc-7+super+pro+instructions
    • 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_off0000dd82.bin
057d7137ae594c57f6a14e9f427b66828c970e955473ef382079c2cd5361fb46
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 16348 bytes
font_01_sfnt_off0001077d.bin
7e4adc2ec2dab7f745512ee63e8f438b1cca4b52b32f61fe2b34a6dd7b1f7d41
pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 10828 bytes
font_02_sfnt_off000120bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 16792 bytes