Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a90bb9dadfb696d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 09:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37d2a5188e5ae548941764b3ba4a7b12 SHA-1: 1d054235f818d303b28ddea4ec23481182fca6a1 SHA-256: 8a90bb9dadfb696dad140dc9bc63901dbd2053892dbd00cea09cfb3687c2018e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://albarossa.jp/js/upload/files/97300347776.pdf In PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/figavabipujidemamepanomib.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/supasobitigozususira.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/98803871682.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/rapufixudikubedotuv.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/48614767646.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/remugidivepexokapu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c46ff0f9e---37789745617.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/nawureruwepijar.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/14400401751.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210903002508_lxnb5m.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sggdsl021utvtvpgqelld906bg/gusezo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146fbd812954---gopej.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/46466806401.pdfIn PDF document text
    • http://www.77ice.com/upload/files/xibakimuruziwutudobo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147ac2735809---ginitetaditon.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/45783390381.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/kiwefipoginiguzevovuzuji.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/fumedomuluk.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/8491268696.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/pigapipakiwo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dccd778be---xakifalivuwitowupurazu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161443e649e338---muxawuvobobes.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/xinaloxig.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/panarigelexikujane.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/jekubomuxadokugozifef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=100+in+1+games+apkPDF 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_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 18048 bytes
SHA-256: 909923d27f2907c52a97c4ca7263dd9c436eccaa2085e98db56d604e2229d5a4
font_01_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F73 10400 bytes
SHA-256: 91ef600af320fe1db552f91be5087c79731e4b6178624404a3023fa0cb7e6875

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