Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffa7f9ef015e23e…

MALICIOUS

PDF

100.3 KB Created: 2021-08-13 09:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9a93dbd0bc27903c0cb1a70b6ecbd66 SHA-1: ccf3e448121ce0d628e51547c753f01d527cdcca SHA-256: 9ffa7f9ef015e23e857dace8ec6acc2afb922a3955fe2f1f6e18dece510776bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e10980594d0---47857244754.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62bc2169a---wititutopuwosiniz.pdfIn PDF document text
    • http://fedime.org/imagenes/bofiratudamas.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/velusuvuni.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///worab.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5599a1ad3---fonulekaga.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a5050fda---fifadibonuxa.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/005e57e2e55fb26a5a13b46ef9817c0f/78912822222.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/75634986308.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/19952124505.pdfIn PDF document text
    • https://botroul.be/uploads/40058819043.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/watipugizurag.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f73b77ba---96411830921.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/suxobotowosigimazo.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/pezumifasegagekakazokopa.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ef62e38a0---2522149183.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/3vifntv3j88ks0k9c05p7544l1/96870764993.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099a1fadaff9---80183516516.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/zigixafavepibidamulamud.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fbae2c4c---73859355530.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095459ea23c5---92090887.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/tekedipokawipomasenejivuj.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/amm0aocc3q3fgjcuefupc952f5/30839826261.pdfIn PDF document text
    • https://btegypt.com/file/22357409989.pdfIn PDF document text
    • http://usmleworkout.com/files/file/gezeximazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mathematical+morphology+in+image+processing+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_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 18648 bytes
SHA-256: ebedb52f3bd464aae8f89157d1de7426d759f3c85f5dca2af72b5ce42350aff9
font_01_sfnt_off0001516f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1516F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16986 11176 bytes
SHA-256: 80fa8b2e1182a6348e2d96947d629834b36f5451d253c375b2425fb5177eaff7

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