Malicious PDF — malware analysis report

Static analysis result for SHA-256 7912722b188106eb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 16:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15e996ea120f06ce381f54dd59b65228 SHA-1: 7db6df536d7f89867e92f96a271fe19902835629 SHA-256: 7912722b188106ebeef4d91c23389dbcc541d2f4e3262192bc40f99fc6833342
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to sites hosting malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://kistours.hu/userfiles/file/wajotarelim.pdf In PDF document text
    • http://hondatayho.top/img-ngocbao/files/bupubemabivaketuzode.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a41eb687989---wapepibusewig.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/fizoj.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9e0e2c9c1---23032153028.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/mitevevekomorolez.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/datapololus.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/c9e7f38198ca0742f0e792ba53155c89/82043981057.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/xejebolulimeb.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/67d1fa06972a8da2261281dd9b03c76b/maradiwo.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/29849958372.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160814dfa02bda---xujiduz.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/38234913098.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/terujixobezugojirot.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/42342666309.pdfIn PDF document text
    • https://digireg.cz/upload/753228717.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/jekufetarubemagewafuta.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d432514035e9df372c09994fa6ccb3d/44102452234.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/1048699170.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/17070831994.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/cf276ac0921e53ffcb08b7f3e4deae49/52097443732.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7511cbfa2437022b8d90e122fa4cae9b/subikuborefoje.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/87cb2bbc3086fb08e8d90a41bf6d5836/99792238588.pdfIn PDF document text
    • https://coevent.ru/upload/files/80686335350.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/badovenepavonifababivug.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/luwizitavogoziwad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=definition+of+business+administration+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_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 10852 bytes
SHA-256: 1d06fb61d13ef1a3754e766fb54707a8738b796a8af6edf926bf74b5f65c1292
font_02_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 17404 bytes
SHA-256: 7bf571a56a50c8662b468306aa78197a77a7f8c1dc550881520c8efe421c1e6f

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