Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbd14c88e78b142…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 20:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ba21cdfd2e99429bf366c17ceba536b5 SHA-1: 65adf77c953da0deb4c0db00763aac1f3f79206b SHA-256: fdbd14c88e78b1422e2b19cf856a0df8e9127a4f73a9eb87ee7591687b0771f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16141136ebbb04---33367203746.pdf In PDF document text
    • https://jck.ro/userfiles/file/zojezifezivedotexig.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/gelozirudatefixadomixizu.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/17908328768.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132febfaa5bf---xufuribavotozebil.pdfIn PDF document text
    • http://poultech.net/d/files/topejuwalerofavudiget.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/17s1e1g6m4o91eipd21amjo674/ravunozejeva.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/74550112283.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c957475b5b---fagarakiluwon.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/xilipodexotujokelepabunuv.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16145ae0c82e16---tisesuxuwupifadelen.pdfIn PDF document text
    • https://people11people.gr/uploads/File/38602612167.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/667473675.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134e354c8e2f---benimanaposafop.pdfIn PDF document text
    • http://kisito.com/userfiles/file/wawezakisiga.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/tekepapun.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/xalilejagunetelunimi.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613450ab86180---bujisowedugokukefupepabo.pdfIn PDF document text
    • https://castel.ro/userfiles/file/wuwawutavenemoretaziv.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/36349982045.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/kujobafinutawuvetu.pdfIn PDF document text
    • https://kawanmto.net/contents/files/26307107591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=quick+books+pro+advisor+loginPDF 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_off0000aeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAA 14376 bytes
SHA-256: 835ec9c12283bfb30e4a223435bd8b62c7e1fcfb57e35cb7f6c0bbebd274c62a
font_01_sfnt_off0000d2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 10916 bytes
SHA-256: 096723a6823faa92a3aaa1949b8b4d6b739713111f1bf8ed345b4997134f6c33

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