Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a06e65894b183f5…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 01:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27b0aaea0709989d8df9f8bdeb3e84ad SHA-1: 9420ac319f6cea83ac287d8cda02b6faa63e2a85 SHA-256: 8a06e65894b183f5b93e4ea509d844b19dd1b5eb93b465913f102ee9b51b149b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URI firings and compromised CMS upload links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ad4a67e5---54709367011.pdf In PDF document text
    • https://teamcode.net/upload/files/jatap.pdfIn PDF document text
    • http://aimic.com/userfiles/file/27869390465.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609999dce74c9---vixazizipanuwofi.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/vujetupumewaxesos.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16124e986316e3---56823361625.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160825188c557c---75126078488.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161239b9147f4a---871142319.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e94addae1dfb1823c0ec01e3aed54b8a/kogonot.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1916758d8---2926750004.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/87428395431.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e5ab0f43eca3bf55b73f7c4dfdd81875/9916385576.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/2ddf0911bb690373b31efd79058cba2e/jokixuminaru.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/tupejesugijorixubor.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/62599737889.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/44288162352.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0v2e83d0ka55ou1819d4anjrg3/49548033837.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/l1f5lhf70tm6kqf067immj5l7e/50711139531.pdfIn PDF document text
    • https://posh.hr/files/nunolulugegejuvemazetem.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/27173254885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fibrosis+pulmonar+sintomas+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_off0000ba5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5E 15868 bytes
SHA-256: 2dab4caefdf727cf3bf9502dc57a097557158bb564b5bc317663be5318d8633e
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 10744 bytes
SHA-256: a947d3d86bf9c086e0a5425a61db139d4972b6eb5e75d2a0afffbcab2e33b677

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