Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17ba4d41cfe0a95…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 10:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b7aabd244214f02a5a4fae6bcfd4670 SHA-1: d6a4eeaf498c01ea004326865ac7675422eb3ae4 SHA-256: d17ba4d41cfe0a9594c9f87bfd2d862af19b4ea3e2da3f0ba7d12c865bd3ebd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aven.su/userfiles/file/xejimoluwidesil.pdf In PDF document text
    • http://shipagents.nl/uploadfiles/file/46280623836.pdfIn PDF document text
    • https://www.naturartshop.com//ckfinder/userfiles/files/78340550355.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/32154916475.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ana8o5a57tnegg398tg970cckk/90424779556.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e0f6a5103---4879020123.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///zogike.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607523b8d52d0---53928368538.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/v9fjv0pj3kt59q0ecpu76j28i3/62166481854.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/fudatumojupinuxonotomal.pdfIn PDF document text
    • http://suecoop.com/UserFiles/file/43953501460.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/pawulerejikatoxoto.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/nezor.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fb8708cae---30597954791.pdfIn PDF document text
    • http://erdbau-rauch.at/16525367195.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/91594443878.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16127bc362cdbf---66183615826.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/59867245970.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/kuxuraretadufu.pdfIn PDF document text
    • https://webmenuplus.com/images/file/74020238656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=knoxville+24+hour+arrest+reportPDF 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_off0000be10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE10 10804 bytes
SHA-256: 0c1cd5655e14f4f4b1fdacd125d653cdef674b48390f69d83827722c492cb18b
font_01_sfnt_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 17868 bytes
SHA-256: 7bfe65e2047a82f5d76d964e3d593b5c0b9e3415de1090f04a23ad7c283472a3

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