Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a4767256dd1ec5…

MALICIOUS

PDF

68.5 KB Created: 2021-10-02 02:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19df9422f1b0e7e71b576ddcaf5001bf SHA-1: d3a9abe0480a998d405cfcf2543d8c4150573a12 SHA-256: 96a4767256dd1ec5130ac22c1c4d7f210abbc4241db7404ebbdfa044cb6ac823
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several of these URLs point to compromised CMS upload directories, indicating a potential for hosting malicious content or facilitating phishing. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=excel+full+apk PDF link annotation
    • http://obchodsezlatem.cz/upload/files/73336511957.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300415f0dbf---xuxaveberitamumadeg.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/7809538409.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/goxolulevubaxaganarazuxe.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/58961083769.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/wateluvevu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c69f12073b---gufetos.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/79454472187.pdfIn PDF document text
    • https://devisme.maxtis.com/userfiles/file/mowokedosal.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/tugono.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/91711658246.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7du3gapi1bjktm5hq0qctmsb5q/14161373879.pdfIn PDF document text
    • http://tipiland.net/upload/file/gebopazuxorasidaxadonope.pdfIn PDF document text
    • http://soc-in.com/data/media/files/mitonagexivepek.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5e3bb4612953c799107d76aa31612ebd/38905222167.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/95142645462.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/pikisizaka.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/39046025016.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/4278463671.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/1074415863.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/10848327465.pdfIn PDF document text
    • http://annabarons.lv/files/files/86314893047.pdfIn PDF document text
    • https://cubic.is/userfiles/file/74057081595.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/10868287619.pdfIn PDF document text
    • 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_off0000b228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 14472 bytes
SHA-256: 9b0839de11b95579aadacf64012dc7c68009a5b842c817e207713004965c9cc4
font_01_sfnt_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10068 bytes
SHA-256: 0575d7d87e4967782ed3e3215a2f658284356c9be28c41073910e86d176a3d52