Malicious PDF — malware analysis report

Static analysis result for SHA-256 088a8e5f1e429d8b…

MALICIOUS

PDF

82.9 KB Created: 2021-10-15 09:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1325bc72c3a99c01a62f532f41bf6e15 SHA-1: 25e04a0aa83faaf650dd55af733ae9aded2ed1c0 SHA-256: 088a8e5f1e429d8b85e1ce14734468faa0cefe38f23292f959204075d203dbc3
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to host phishing pages or distribute further malware. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jdjcnc.com/upfolder/e/files/20210928051106.pdf In PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/ruzefipavomeketalexu.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161364b1e82553---moxugodoxinoderik.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/iijkot8fmch98ldnp8ohvra032/nukiletozemejisofawoxov.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/bebusepobulobuwa.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/buxar.pdfIn PDF document text
    • https://ons-station.com/editor_upload/file/97565496933.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/rezotasaj.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/r0q97odgcsjh33b3mr4si75c6p/73312433984.pdfIn PDF document text
    • https://majubesar.net/contents/files/nuwenamubotovoxuripigoju.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/tukik.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/jibanija.pdfIn PDF document text
    • https://kimcert.com/E/file/morefixexaloju.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/pefovadejaladepase.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/47602814214.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/pupanusot.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/7322184996.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/98785690897.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632610666.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/lurunofures.pdfIn PDF document text
    • https://3territoires.kopro.fr/userfiles/file/xebow.pdfIn PDF document text
    • https://inks.bg/userfiles/file/surewugi.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/42203532598.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/UsNeCLCzgYg/uplcv?utm_term=ninepoint+diversified+bondPDF 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_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 10464 bytes
SHA-256: 0f41f6da8ad4409b7be9132dc9e12af033cfe25cab33db682f60ac472e251041
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 18728 bytes
SHA-256: 4051a6eba4b482dbff2468c3c395872901bf4786b26e4c0ab3d823499f95c9f4

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