Malicious PDF — malware analysis report

Static analysis result for SHA-256 408b6944394392dd…

MALICIOUS

PDF

83.7 KB Created: 2021-07-20 21:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ef3df85311160ce3b32aeb30b11d8d48 SHA-1: 8973c225dcbde1e1e79114a836c91a98cc31ae96 SHA-256: 408b6944394392dd0c0e7309a0d321bb77c80700f73994e07004406b040edfb8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://rt-totaalafbouw.nl/userfiles/file/17876171146.pdf In PDF document text
    • http://alnadaoil.com/userfiles/file/movodojeradogiramix.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/10926582578.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/31100994666.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/93260424930.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094fa7e36af5---rokilosut.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df2ae115a61---fefon.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/30384962183.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/jurusegeg.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/dimojekiga.pdfIn PDF document text
    • http://patroha.hu/file/demejamab.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160822406e509c---14526182776.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1eaedf2262cc027891ba1d7a33771657/43646514648.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/29544398963.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21ccd81e16---pofanamifukukaw.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/98040655270.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ce7d06fee44972c114f10b6963c90375/bikarowesefavopaxoxiw.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741adbbc1f8---lujemap.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2113cfd7b---41644940270.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb8a3a6955b5d94749a958fbc55cfb14/40386951658.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079936f700d5---19572064618.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/32876717441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=a+love+letter+from+me+to+you+sticky+fingersPDF 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_off0000e24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 10868 bytes
SHA-256: d3b4286938ec4ffc76363e36594a348f6abc8e641ef68ef5d6c18bd886ef3b26
font_01_sfnt_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 17472 bytes
SHA-256: 6d49cb7fb84cd9867a26fa612e4b4a4641b12467c6641530fc9b6db5a3d6c7fc
font_02_sfnt_off00012988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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