Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e09ab50bbff4be…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 23:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2e19ae932635190e835b5ab0fd40e21 SHA-1: f116e8b06105da31c042a6f1c548544878ce8675 SHA-256: f5e09ab50bbff4bea979c5677c51b6817c9516729e763df9089eb072d2cb9b08
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and extensive URL list suggest a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=herpes+zoster+thigh PDF link annotation
    • http://dlevitin.ru/fck_editor_files/files/mapesowipidudetajakatu.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/deworitodovarumojox.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d49f2100e---43162933869.pdfIn PDF document text
    • https://ultralloy.net/upload/files/jedidulawe.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16220406771369516080.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b59b34d6c---sofimuwi.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/31903345971.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/qvpa0bcb90nf9bhqp4iflumgme/bewasi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ec57cedf6---57920235473.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/141tmbavdsa3hm94gujhc00u63/16892606496.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e16da5be5---kalituxivi.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/66180959433.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b73dd60324c---wozutipaterikamisoraxu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dvtke3vf5ontt0ttmq6pqvl2lv/35272753564.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/kadafilolilukalavaxebik.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/fefiraxalijetutadurupudog.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e9fbca0a---56613175649.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/18265863799.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/fawomomutekolewuwegogoxuj.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/kuzuxit.pdfIn PDF document text
    • http://lachina.cn/upload/file/57826543157.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ob6rdm6o1q3s2uivla8hr15sb7/13721413186.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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 10268 bytes
SHA-256: 089e094db9bcd0f5b1b4fd396dba867122f82826cf6dc0b64a5d33bb1c68b6ba
font_02_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 16852 bytes
SHA-256: 2c080e6ad1258a8b6e2e746264b565b875213bc424bc58729d6202096a0346f5

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