Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4ea2a10756c313…

MALICIOUS

PDF

87.5 KB Created: 2021-07-03 19:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf05f95a2155f104b1870d4435441886 SHA-1: 0fa668e55744c369a0611911d5c17a2efbd4a084 SHA-256: 1b4ea2a10756c31395e72225793be8010791eed5599afea3e7fc1148b0ab9be9
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, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. These links likely serve as a lure to redirect users to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/begmsgv8cljfgmjdlm855firr4/89193182414.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6472b1fd34f42f51636924c2fe60fb62/72448697415.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/75753e4a3418a265e3ce100bb75b0251/69317043234.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf19c7b113---lebezurujoveturajep.pdf
    • https://topclassgreenery.nl/images/file/lebobubivawomanibodomabif.pdf
    • https://marblobaths.com/app/webroot/img/files/68392689912.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a45144b939a---bazesabumabanemamev.pdf
    • https://sanruouvang.net/images/uploaded/file/regepedokuvanud.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/b88r6dfv6chm24dhs10s557il6/54730040805.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b8570f4d8---fixaten.pdf
    • http://aarogyamedico.com/userfiles/file/xowifo.pdf
    • http://sam-global.info/files/file/66232960773.pdf
    • http://thuexedanang247.com/uploads/image/files/kinom.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee1add407---59769315916.pdf
    • http://ztkammer.at/uploads/file/nejosovebazifoxexilojeme.pdf
    • http://dotacjedlaoze.pl/userfiles/file/1731969015.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607624f821358---76956194553.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2a4g1s2lc49knl372jpm6n77o4/97274855011.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/32375bld5fh0ntvr9taa2c6pv2/48610218677.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/414e5fd1e9dbfd218a64cff796559c0e/degogenebebi.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/71434970066.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2915383c76---80214951795.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090537dceb00---82645306333.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3009a61810312399f3363376cf9316ac/xuxos.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=co+founder+of+apple+company
    • 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_off0000f294.bin
3f9c3aa27c93938653574011f2eaa801d4df9c41e7430d5efb3c0f3e9250dc63
pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 17760 bytes
font_01_sfnt_off0001202d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1202D 16792 bytes
font_02_sfnt_off00013844.bin
4649a83e4fa456f54a75fb6f3ffa6303a89ab7fd8faf86eadf68b243fb8f4dac
pdf-font-stream PDF embedded font (sfnt) at offset 0x13844 10668 bytes