Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9d79f4925d09af…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 03:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73251cdba6ef9b8fd8814e779a4bece1 SHA-1: 553f83f1839f20320c71815794a6130d91c8c515 SHA-256: fa9d79f4925d09af43640ef49887b5b337818f311ddab3c741c2b6aa67e036b5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The presence of multiple external URIs, including a link farm on disposable hosting and compromised CMS upload storage, strongly suggests an attempt to direct users to potentially harmful content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://netinflux.net/userfiles/file/joxuverasugomaj.pdf In PDF document text
    • https://nexapos.com/upload/files/kemexupizazawoluroj.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/45944433800.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/mifedikegababuluwuwux.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf443d26f2---30147146294.pdfIn PDF document text
    • https://zzwgjx.com/d/files/kiladena.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/16878023987.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/semenozixixokufa.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/304bc605f7683e77973dedba510face6/94297830553.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/37551905164.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mewivusogetojubevopof.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/sifelivuvipuwogoz.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/mozutudusuguzofarije.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/89431547872.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/41356365695.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/bedae11cc9dbcc9fd4c9d2300a9ee7cd/77783661861.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148daebece82---wezajazazudarujo.pdfIn PDF document text
    • https://exclusivelimoservice.com/ckfinder/userfiles/files/lusimodixefaja.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/xekebobanap.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/nodajiju.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/76098935724.pdfIn PDF document text
    • https://chp-travel.ir/data/file/42434379880.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/66ee45e2c590726c3a0cfa1b408e1c97/furorunamozalupopiva.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/41160642472.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/nelofajumatinol.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/91486960821.pdfIn PDF document text
    • http://badgerhillfarm.uk/6985260051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+roblox+generator+without+human+verificationPDF 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_off0000b3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 15720 bytes
SHA-256: 1a9fdbd0dbcd000c75759bb65034d6d5aa949e84b11c4beac03867dee965bcd1
font_02_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 11084 bytes
SHA-256: 136c26a2fe758a1dd3ca337c43ad63924ba8116b2c124efb206cae38fbebc0d4

Open this report in the interactive analyzer, or submit your own file for analysis.