Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc13320fb4581a5…

MALICIOUS

PDF

82.7 KB Created: 2021-08-14 16:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf82d64e250672d13fd7d76ab278903f SHA-1: 35f08d935ef404654b735149840c265468662368 SHA-256: dcc13320fb4581a56e4542783afc47b14bf33cebeaa51f3bc6bbdf75ca0ade23
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malware or phish users. The ML classifier strongly indicates malicious intent. The document body is unreadable, but the heuristics and URLs point to a distribution mechanism rather than a direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://cructi.ru/uplcv?utm_term=minecraft+crazy+craft+mod+download
    • http://emekyesiltepe.net/images_upload/files/19253769266.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850abddbbdb---55490269977.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3d6e0dda---29496992336.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e1b8d7f8f9af70c6c9a375cf32e527eb/16467469483.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a70ad59d7---59476492368.pdf
    • https://adepotcustom.com/UploadFiles/file/20210429184216163.pdf
    • http://eternoohydro.com/d/files/34817173634.pdf
    • http://apcmagon.com/userfiles/jogadoxopixatoxafupu.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a7085bd1.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ccf498411---mamavilavoneb.pdf
    • http://sakem.org/userfiles/files/tisanezolivenukobejox.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b4779ea3---mabutelomukidilaleletolor.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/75230094728.pdf
    • http://nuitsdartistes.eu/images/file/dokunonupep.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/7h17eu9hcifhu76v1hcmjoavmm/20216622240.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/990tvh2g5p2r00va7b16bhgg91/81649286566.pdf
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/dawevipedeza.pdf
    • http://vervesimuhub.com/userfiles/file/12854670502.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/cea3151a5d5d3542b81fd6511ab71f49/38606454794.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/644d5d67789a0f84cd31c4e4b963f08b/14059825845.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc82e85c64---98494696728.pdf
    • http://jkohut.pl/file/81476588839.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/97717598461.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def0584f210---wowefikibukimav.pdf
    • http://ladakhtripmaker.com/userfiles/files/19795495359.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://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_off0000dd7b.bin
e5ff3f4a9a1748253b35627d0cc99fcea9f72e066f8ad63872c957d3d118eb80
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 17632 bytes
font_01_sfnt_off00010ae6.bin
174cd765c1066e3f5bbf61b26c162438c2fac2731089b6c2b96d4e350bb0d866
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 10724 bytes
font_02_sfnt_off000123a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 16792 bytes