Malicious PDF — malware analysis report

Static analysis result for SHA-256 d332439278e48bc4…

MALICIOUS

PDF

83.3 KB Created: 2021-06-29 02:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 25f0bfa09b068e21e875dd10b335f355 SHA-1: 7401f012685fdfd37150e94d88952057ddc7768c SHA-256: d332439278e48bc4a14bef2c601a4c89793432e5c4cc2ca62aefa0c63320ba6c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed to direct users to potentially malicious content or for SEO manipulation. No scripts were extracted, and the document body was unreadable binary data.

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 http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/t7s1ssdkr17417bg4aj1rbln36/jomatog.pdf In PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/wedazu.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/povomi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afb2efa3433---66873535538.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/123569dfbcf6d54fc3e079fabd55fd68/58196889351.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/pupurosaloneze.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/muvuzeboxubudopinenu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607531b12909e.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e05534ddfe6ecfedc9f7d66e2afc4194/wemodubod.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085952b253d6---xepamorajirin.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/kre43fo83cjbfpubjdqnnfv87c/babulo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ab3ef9a9a620811401bff3317db1b786/72575584398.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/marumivowuvinonadof.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/zokedomuxazinizaregaxula.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/85806541577.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/gulekuxemus.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/fudel.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/36872e1488738b5d7781dfbd4c8a4576/monezezuworegiwokikuraleb.pdfIn PDF document text
    • http://cartopack.com/Images/file/movixemifexu.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/trbh8eogamdgn4i8d3vkb5bino/41378172013.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q8nr0rrhb9tpfclh8bkqbmjbq6/13326644233.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/navelosop.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160862fe53b692---nirelipuvi.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/csicmoni5h8b2vkujkkfdbj2gh/47306565172.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4e1423b3a026bcf7c93e8fc92e293ce0/xozom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=prey+for+the+godsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 17988 bytes
SHA-256: 2e7e842d6427043ecfc5705c97d70f640eb12591b437a69cef4cbe2c4ef7267f
font_02_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 10344 bytes
SHA-256: f065729afad82fa3fc0e81f8c1ebc997a9c7e07dca60e248c83b60317ecbee62

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