Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc7a56c4bcbf257…

MALICIOUS

PDF

100.7 KB Created: 2021-09-04 07:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 30213e017893e57d74f4f433b4c125e0 SHA-1: be1c2e7ffd84af428f0de31049cfab029f3cfdc0 SHA-256: 4cc7a56c4bcbf2571b79450b9134806728e82a7020af94c8eec085250c7ce655
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV and ML classifiers confirm the malicious nature of the PDF. The primary attack pattern observed is the use of a link farm to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/d0bmrhpjh7aftd9sgko5mhfrs1/tipirajezixopoxitisazo.pdf In PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/dd29e4b747735902454ae8925d60bbc0/soxofe.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa8c4560e1---5649912542.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/zeteruzijaju.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607430ed88298---pediw.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/momumazasugagugeso.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61f63b3c15---59231033542.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/356a4cfd8bc5b0fc1afbbf5c4e20dc4f/todipinibelete.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/33460584119.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/kokir.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/fezabexav.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b9ed9d735f9dbdb6e8861e3522062607/bukowadagonojefixekumi.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/47003778309.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/79057405289.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/fudug.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ba1e6fb7d7e73e6101d2c8d122fe9fc6/wopigowupixuma.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607361391b9fc---21170725997.pdfIn PDF document text
    • http://webbuilders.com/files/file/12629981713.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716b981c566---79504242362.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/cfeb6013fa8f0b36bf1d469c237d119f/98374760070.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gh8pcgb12hu5b3qcrufi0b97a0/35397917575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=goosebumps+book+7+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_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7C 18384 bytes
SHA-256: 25dbf03d96453127947cdc8d48b16c03e270429df460fe9a052908d7d291a9b9
font_02_sfnt_off00016d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D97 10480 bytes
SHA-256: 132ca10e5a8c2f2a0cfd701693372b05c4935dbd9ba1b63c52a04988964f756b

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