Malicious PDF — malware analysis report

Static analysis result for SHA-256 75652f069d727566…

MALICIOUS

PDF

84.6 KB Created: 2021-07-14 04:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67160b3bd45ae02a596ae1b96dffcef7 SHA-1: 81f52a4b03f8d045d4b570990b08c6fad7f1bab6 SHA-256: 75652f069d72756635f012a2badfb8aaa4eda5964296c733a6edaefb5c667180
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the sheer volume of external links suggests a primary function of redirecting users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=bypassing+a+ballast+for+led+lights
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/4872021ce49adecf3a8f5c341847df74/28266681675.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/29d523f0f17029dd8b259714e83a896c/lefus.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ed2b36b4---riboxababobotevetika.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca719cdde---29920508172.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ofofkchf9ng13nb30po5ssianb/27579770495.pdf
    • https://tavcam.com/upload/ckfinder/files/busijoforuwimoki.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/77r9en21ng5hltg7bfc860mbvv/wejazarijowipovagolote.pdf
    • http://habitat3.eu/userfiles/files/75677221793.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/1bfe60e7af4cceb7f6521d0b35edcd32/79459397276.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae12009392---4599739739.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ahsfd9k653p3lems0jtm5augsj/mimin.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/c99176c36596418108cf2067b2978351/xewazixez.pdf
    • http://moscowprice.com/content/xuploadimages/file/99670221481.pdf
    • https://mariellatriolo.it/public/file/73662582503.pdf
    • https://arendic.cl/files/wajifezogovexo.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c3faece506d---83556731741.pdf
    • http://starsunited.at/upload/files/lesetijexewilodegidanepa.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2785f444de25c644a80e604e4d97616f/kuwigoviwezikera.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8fe3bdf07d9979f1fcf3c1fcb6dc55f0/98592543297.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608caa18b62d8---pefuvu.pdf
    • http://optikametuje.cz/userfiles/file/12150527466.pdf
    • http://vhktn.at/images/content/files/38515074289.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/dccbce03ac45f994b47551d0b8799a15/numiviw.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/99671813870.pdf
    • http://stolizstekla.ru/userfiles/file/repezureziw.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_off0000e6a3.bin
8d790015ba4002ece08fcc56fe14978b8c71f5e44a9267d6e9c661364ec9d35a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 11084 bytes
font_01_sfnt_off00010008.bin
7a677516d580a98e6130677485c1f58eb720b5ec9c1b9f5d3962cdbb9a50c876
pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 17284 bytes
font_02_sfnt_off00012ce2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE2 16792 bytes