Malicious PDF — malware analysis report

Static analysis result for SHA-256 18edeed8a7b352d7…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 04:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e50123a7fd64383c67b42ce0eb5fb22 SHA-1: 05ce2c25dea64f1275f3dcf04aecdf18426f4a9b SHA-256: 18edeed8a7b352d76a8d60657d5aeec3af4d909f53914397e46945b4319b8877
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://travelci.ru/ckfinder/userfiles/files/53345361060.pdf In PDF document text
    • http://epoxidice.ro/mm/file/zumomipanosizuzipev.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/gafiwufemujetezujazomawe.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/75958152935.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/234ce335fd505e3aebdf2f119becf111/sopanivimafaxon.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/93938456090.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608924f041aa2---fewomaruseg.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/84410942619.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/35130511481.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/zurimejusagapibifurum.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f499f044c1---xeniluvibamarufigedodale.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/8b84v0g8pro04c5g7s33ro4e92/82535633470.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/228b285c1624c1d9d1fa87b5c6945179/2492794013.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/xapobugen.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/nibibigisa.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a36ceed18429fe3fa47bbf74cefc8f3e/98442465372.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e4d7e8cbdc6cc5f5391a7bd4eac4d5c0/tokuwunopolisopel.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/lozisadopuxujowizoz.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6cca3d3ce---86354387614.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/6969214495.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/bb78352f8e5a36319fe3b4b85dfda4d7/12244057266.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/16913150641.pdfIn PDF document text
    • https://menu2uplus.com/images/file/91710190556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=role+of+social+media+in+business+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_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 16880 bytes
SHA-256: af2d4bd8a924ae862ce1687039e8570383f9e5505c11ae387749923085a15e6a
font_02_sfnt_off00013f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6B 10868 bytes
SHA-256: ad4c7c7b3f516a0fca2083e789c2dd2d9a9fda6c73ea663c3ee704e6970d53f9

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