Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c7bbfa986c4948…

MALICIOUS

PDF

72.1 KB Created: 2021-09-15 03:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ddc6201799fc8603fce7ce252c4f7371 SHA-1: 18012dfea4286c56235f60b9b17206203256109e SHA-256: c1c7bbfa986c494865a635d2e978597bb0be36e3e67ec6b62aa10a199dd64782
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload storage. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of this document being used to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=degree+to+radian+measure PDF link annotation
    • http://konsultacjenaukowe.eu/Upload/file/wavijulerasajisipoje.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/88379011302.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/pokijugefenufotixa.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd69998b8---42049903234.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/pifegizatikeziridowanavep.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/fenulub.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/mowuvixutomolegasozepomu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161397a22328d9---66797524496.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f159488317---lujoxededafob.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/59631922762.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/revezugomafikara.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pupazapadegekefu.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/47656303518.pdfIn PDF document text
    • http://abwessex.com/uploads/files/99071691971.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/19134178229.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/25315582159.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090210052073499.pdfIn PDF document text
    • http://osiindia.org/ckfinder/userfiles/files/42776872299.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/suwonuwinarugalojemuw.pdfIn PDF document text
    • http://www.77ice.com/upload/files/desune.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1614139d1072bf---novirifidanuziwi.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/jejixerajinab.pdfIn PDF document text
    • http://byecook.com/ckupload/files/35773897941.pdfIn PDF document text
    • https://lecachet.fr/docs/files/pawojorutagelalef.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/37091450549.pdfIn PDF document text
    • 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_off0000b893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 10644 bytes
SHA-256: dc046cec980a5082d0552436f65e437324656a05d8fd499f1cef4c84b17861ea
font_02_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 16424 bytes
SHA-256: 9fa08567485f0ae34c13ea4a6dadb1dd6e40ff1e264bf6fa87ed0b709d0e6f72

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