Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2906ec96dbe79cc…

MALICIOUS

PDF

98.4 KB Created: 2021-09-08 09:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e06d9e080a6967095b9d882c8e326d9e SHA-1: 2c85e757996c0bb7412d96aee8fcff3e6d11108b SHA-256: c2906ec96dbe79cc1d3d58cd24b277a311aeafda5687f21b09d40aa0b0bf4c15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. No scripts were extracted, but the structure itself is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://hzdsbg.com/uploadfile/1625650224.pdf In PDF document text
    • http://nusratali.com/userfiles/files/bixudupijujiluselema.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/726feb14cad6eb8373db276a9adcb9ec/senegebasowi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0e603668641fd8e34c95785656580fd2/dolewufomewifaz.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3e6971ba642d6f4a17a44ce3621a0a28/jimud.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/68391769602.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/4359456936.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/wipawozimono.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/koweledamuk.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e079c662542---6493778794.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/80912497828.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/91213054809.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/63931979751.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/12479389381.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/rujetifafufetimominafipo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/2bf3p2ahkro9nt7g223qrqtjt9/24083248017.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/sumasinin.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/85024979184cc311f8685340f3a63fcd/45727101478.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/tisafalanopunejaduja.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd17fab0e2---24038532700.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2d92c1377---tijulugasimuwamo.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/kawisuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+dermatitis+atopicaPDF 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_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 18780 bytes
SHA-256: d78f6194fa11b3b302505bdd9d99cb66fc60647bc554076b92938370575bb23c
font_01_sfnt_off00014c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16433 10632 bytes
SHA-256: 1dd723b05175fe7e3db4da3bbf4259f91d0bab62b4212c076eb62e7a34cd5f37