Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fbe6e737f882d3…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 12:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ad4460cea6d12976385318f29e4abe9 SHA-1: 3bf589de9caad66613e96de3357eb210d774ea75 SHA-256: 00fbe6e737f882d3c9cf3676d4c4892a61ddc02ca5337c6516c7c3c7356a1259
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body was unreadable, but the presence of numerous links and the 'SE_QR_LURE' heuristic suggest the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kemxoi.vn/app/webroot/files/images/pages/files/doxevivizoripidulem.pdf In PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/xexotibasewunu.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/27133209030.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/sipiwafaregewesizetabadog.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/97965176054.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/wujumokopabasatal.pdfIn PDF document text
    • http://topas.lt/userfiles/file/58694119777.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/nowizivufozulowa.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/xirufavajagolixa.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/25895675428.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d4dd9ea5---reburibul.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/4211903179.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613369a55a9a7---galironoxediwowupiwepo.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/12990649826.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/15941581990.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630847850.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/18/97211158250.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/zetowegitof.pdfIn PDF document text
    • https://majubesar.info/contents/files/bibukaririfora.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613825947a48d---rugodegebanoburijagogula.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/693459586.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/1693365339.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/66210928016.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/sofebutezivenugemudedan.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3c404df43297dad49fe0bc7c2b1a3a92/xijexekikesob.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/jumotidunomagamin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=connect+wifi+with+qr+code+androidPDF 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_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 10624 bytes
SHA-256: 13235cbf7372bd61f9769b9cb63b3b35866a4cc5087032dffc8515669c19a112
font_01_sfnt_off0000cc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC63 15620 bytes
SHA-256: cf9212566c6f30cbe9c91f25917e30345bd4114a4057054f68bc0c83f132b96c
font_02_sfnt_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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