Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f148ebe3a11d5ec…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 17:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cfc248aa06b6f3af48b127bf9bd1a51 SHA-1: 85e1fd354b9afa3ec7f75201ea01ef25019eba12 SHA-256: 9f148ebe3a11d5ecc0c66d31c74f74c59acbf195f2a56c3d60784c06fcb2c7c5
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many hosted on compromised or disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. The presence of external URIs and link farm heuristics points towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.nevjegykiraly.hu/userfiles/files/82097108095.pdf In PDF document text
    • https://sapthagireesyathra.com/userfiles/file/somonasaguwokaxulilozaran.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/14182244961.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/mamugiwamotemug.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/kapufumebawoki.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/5512618813.pdfIn PDF document text
    • https://keongracun.org/contents/files/sapezikaz.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xixoxaw.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/vokujefafidus.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613833d3065d2---rokiz.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/15477106736144ca2ddea3f.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/86089809223.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f624251881b810adf26d3ef3b7d0abe8/60255682023.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d961687495---13111403290.pdfIn PDF document text
    • http://masonhn.com/d/files/53868872321.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/vagiwimijo.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://adacu.org/userfiles/file/20210908063134.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/76236010196.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/tosuxebulimedonoveri.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210913080411782.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/sizidokewoniwevexufuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fifty+shades+of+grey+mp4+movie+downloadPDF 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_off0000d0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 17776 bytes
SHA-256: 7b6eea66c60fb72d2103465c484c990a659ba7ec5d7f23658fadeb1ad6cff844
font_01_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 11268 bytes
SHA-256: d6ca99d0f6f69fd1817efadef158a6154bc027a7e117e84161759b3299b66f59