Malicious PDF — malware analysis report

Static analysis result for SHA-256 665296752b123580…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 05:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbdbbdb9ea3ef72c8c84239a0a31e578 SHA-1: 9efc0b579e7245c3e404712475474f9cf6e96cdc SHA-256: 665296752b12358012a7a2e2ecef74dc55e3353e088908f2963cc0328ab8b74f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that redirects to numerous URLs, many hosted on compromised WordPress sites or disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external sites, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://inprovit.com/ckfinder/userfiles/files/nofipi.pdf In PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085681ebe4fc---wixesefumufimovoza.pdfIn PDF document text
    • https://aashianarealty.com/file/fobugudofepulokiribu.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/72748744286.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/7s5cr43ukfdd02ecqijam8i7p9/37820758774.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/medumosirovovakedebini.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/afb1ff2b73f3568e0b59a56932c6ae2c/31713872246.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/gixokupepojudevamawalexa.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/jejobabom.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/jeroneserorazikoke.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/873hvlvf95to1geihegcs4t552/wigoromamomofusemaxodezi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e15f3fd6562---37583174276.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cdff06aa9---fitigavanizinabovi.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210515201923.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9l74l5dd37m9opct8nn4bdhu97/muxedup.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cv3odct94qaconfvf089395uq/45544492839.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/gixefug.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606e85b9c0f10---63929764156.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/87328285946.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2liugogjloi1nag78c5ldu4aa1/29533658505.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/241b905da4edf3ed6b97893e06072aa6/96184807909.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/moguvinu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d34846b14b---ranidilumuxefiroxajo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fe68ac65bb3ba6947c497b6edd3f6114/vijawoze.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3b77554547bbe345e6f55b214e32b867/sivugevipudavemo.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/nudenaj.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/cf8248283d19b28b14d504907a73f794/30314444598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=compress+pdf+online+bestPDF 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_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 17836 bytes
SHA-256: ba9b311f4a18a155ac20e2165b1ddd21f67f00fd28dffff5d020af1d4755a489
font_02_sfnt_off000135c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C3 10668 bytes
SHA-256: d70cd8f0f63f7a7110ffbc591f5cbcc6c1bfe347c6d78dadf32aa6412d34b652