Malicious PDF — malware analysis report

Static analysis result for SHA-256 a567ec02f1999feb…

MALICIOUS

PDF

94.0 KB Created: 2021-09-02 01:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 04a191cd2d2b830fe2f038cb08df2438 SHA-1: 9929cbe7325731393fe01016b6b1059e12cd9ca0 SHA-256: a567ec02f1999febb4bb8b207df67623cf3ce5fd1574b94c4c367f02a3f6d976
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607140849b056---1967700558.pdf In PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/86d78229bc42b8dfd67a68d82f81f6b9/gedozenidota.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/lukojelewefido.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/vemuladurudalu.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/zojis.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4f06df6d---tadekiwa.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/fowep.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/kunijoridotugumabafo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec1327dd06---54261494351.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/q7k5unau4bejfoa8i7q5qoojt5/24981334307.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/josot.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd11a68c32---morazoxaxalotitonezejexa.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/rofawisegare.pdfIn PDF document text
    • http://vo23.ru/upload/file/55627990942.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0fbc12ac818bb82dfd8184195e92381a/1950891886.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1d3182db37bc519e7a3f0bc6336aea0b/xotavapaguj.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c180f0d3da5---7908025600.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/30336761166.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7580f84345---69849502127.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a78d9e710---zezaperunupawif.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/22647140729.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/14259011750.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073bcfed1470---jizuwowipi.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///pugagupozijuvavufedofuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=install+linux+mint+without+losing+dataPDF 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_off00010ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DE 10700 bytes
SHA-256: 295928475a62c218e88292f91cefbf34d6572e4d5102c179a59235e83fcb7054
font_02_sfnt_off00013b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0B 17988 bytes
SHA-256: 4471f8f500e9a146df972aa7c8bdf21eeba9ec9cad041bef8078a7d83ad2436a