Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44511f140013bd3…

MALICIOUS

PDF

90.2 KB Created: 2021-08-07 16:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27362949977301dcbdcfed28229daf29 SHA-1: e6f243eac2ef9ec1a454898489079c3974037f43 SHA-256: e44511f140013bd347b72169127f705ef0cfff2c22464479b5b76e81d52e2789
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be SEO manipulation or redirecting users to potentially malicious content hosted on these compromised sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://grupo-kayros.com/userfiles/file/15833512628.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4517fb45b0---43225429043.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/mikizore.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3b7b49ad8f3f7a9d223637e870c738d7/56162621171.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083263934583---xilixinilaletato.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ba459735015---84473928117.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/55410792454.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/fabajewakarabamakomolu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/9187bc1c33f4ce981a65c831f5e7ce40/seluwelaxulazaxezu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/na1r50qvsfaneeqgkk2b9oi061/temoxizigutadowibolusudur.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/37425501078.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/gorudozulixefosas.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b622c7b6174dba79fe617ba0aa0550c5/fanemorutarowebigisowir.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d337e57a4---61958538487.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/sujelenumefofat.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16214318835996.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a145b89cc3---sorijusomena.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/dekoke.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fce532ac3---tafofavokeraz.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75af26d589---20209083457.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a029856cfda---wizizefuf.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/17372491826.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/39064570176.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/34146129545.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/93818453806.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210625014936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+job+of+a+maintenance+mechanicPDF 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_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 10720 bytes
SHA-256: fda839109b11c66d7ed73b8ee7c7f84df4587bb306780e561f10ddc78de15633
font_01_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 17456 bytes
SHA-256: 25bd0d564c5661c0310e50b4737337d5cec01c05172f74f309b1d60f3424006a

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