Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d421efb46c0b48…

MALICIOUS

PDF

93.5 KB Created: 2021-07-02 22:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70bf65258e0d6a92d5d03b90170bf4cb SHA-1: b3e4ad8ae2fa349a8327fd67b117efa01e4166ae SHA-256: 92d421efb46c0b483dbd6ee793615bacaf5131fe311140e8149c853715d1f495
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, and the structure suggests a common tactic for hosting malicious payloads or lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/auka5251v69rjqf4lvfhoorr01/sunaxunedapo.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/43993191981.pdf
    • http://ankurgroups.com/userfiles/file/43394866647.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2647060c1---78003500886.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/5939467910.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8ed64980---nekew.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089cd665cde7---bomenemisumawabag.pdf
    • https://securitydm.rs/slicice/file/66963575635.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4328ab86327cd70f7b09b4bd0f55b487/25480606480.pdf
    • http://montaze.org/democms/userfiles/file/dawesubusafikisilowane.pdf
    • http://bostonmentors.com/userfiles/file/69194479209.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qvu91vp7bq2dohmb5am0lmlqgt/sakamarowokuzar.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mf1ndvfrvmh5c7n3avktb51m73/21651575475.pdf
    • http://shinies.ru/img/lib/file/silukutofivanunidekipawes.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ev90998o2g8mbc5v71m709lfqt/81152182975.pdf
    • http://anjilh.com/uploadfile/file///2021042921582545.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/6c70e164589540cc8b3b0f22e9762f44/62835308181.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pp9lvkb26l67u08b13hupo99ec/razukuvizifudogivoseviran.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd6ea9c99---61561545398.pdf
    • http://www.awakohchang.com/image/upload/File/upuvap.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d271850290---nudosewuwan.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608533d7adc0c---julozubuxukixupa.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22e11590c---fepoxopurefulagome.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca81669c24---33509805397.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=o+stock+dividend
    • 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_off00010a7c.bin
9e36fd5629d713dc22c4f95016e8765488df31e34d9bdc7682121dd2ff71ed9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 17880 bytes
font_01_sfnt_off000139bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139BF 16792 bytes
font_02_sfnt_off000151d6.bin
4c4759b73a5b309d3b17bb60502bcd0f71b31e451fe8b29d7fefa7f447cc19cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x151D6 10236 bytes