Malicious PDF — malware analysis report

Static analysis result for SHA-256 d234abfab708f1d4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 20:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10e6b185ef619e14948fa2a66ca67169 SHA-1: bccd8bb8e5414113a18801131e20048e819affbe SHA-256: d234abfab708f1d4a90635c16f03c131389888690b366720b3659a45228c0714
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, 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 phishing or malware distribution. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://kingcraftviet.com/uploads/ckfinder/files/lezabulowut.pdf In PDF document text
    • http://obasekiestates.com/UserFiles/file/60583010210.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088097cb2b8a---94164984908.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/pumifozeramo.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/77567565337.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/sikinozotogev.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/08/14/file/20210814_024513_102.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/pugujubuvux.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/6742842133.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735665f15af---45651596982.pdfIn PDF document text
    • http://eternoohydro.com/d/files/xifiroluvud.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/d7e2da49c2606c391902cd182cf61858/lixitijitekoresog.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/38739921780.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e5009ccbc---24353389383.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/94780274584.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b45eaba36---81644060858.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/41101262876.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/75521277609.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/92863571472.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a289d71a667---96297067753.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/86348324647.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/72428281762.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/7956009578187333234a110d559a2d1f/pomopo.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/fiwujotur.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/fidufutunigezakejarisune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=encyclopedia+of+applied+and+computational+mathematics+pdfPDF 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_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 16952 bytes
SHA-256: 83add94544c71c37cd8d8bfc2a81d48efa17cf98b7c89fcf687a84acfcbb3bba
font_01_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 10980 bytes
SHA-256: df78df05deb65e86aa91466d2db1196ea47807dbd7d1af7c960d891db2024256
font_02_sfnt_off0001213a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1