Malicious PDF — malware analysis report

Static analysis result for SHA-256 2761fdde6c4bce08…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 21:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1af163f675e7850ce2529ea3f90939d4 SHA-1: 6f2effefb0dcfdb35baf16fcd988279be41e733a SHA-256: 2761fdde6c4bce08c3d9b4e03ce19e7a393b51b8d11f735b6adb1aa1e961dfbe
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious sites, potentially for phishing or SEO-based attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=types+circuit+breaker+pdf PDF link annotation
    • https://daiichitravel.com/uploads/news_file/71956385110.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/157f9d9b25f9d1b5255698f833722308/32355592896.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8279312b---togoritese.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/zoviteg.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/91uj3e9omtettltsne6r64o446/minewodenide.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611805070bb91---51375959506.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c44a10dad---68248772613.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/62a4dd23a5f8184aa944cf9f65a6d1e0/giluvigobofoxiti.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/49039925297.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/batepizalidimapikesitex.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/l3msgl80ahgtd3tlju04c6fcn4/dumotu.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/sixudafat.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/79026842886.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/releleseferes.pdfIn PDF document text
    • https://steammining.com/userfiles/file/nafowutizuxuletuxa.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/75546890425.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/80929742020.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/risepawuza.pdfIn PDF document text
    • http://rococosofa.com/files/files/77702725220.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/79761343708.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f91855d4725b8e112ec27652a190bd74/89244020405.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/23950880668.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0fd40d29a---80476313372.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/pelekoraxadabab.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_off0000c1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 10752 bytes
SHA-256: d11d57907beaf9d11c9b08cfd143bcb3a666e39ca4bdce00736d55eeec3fa85a
font_02_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 15920 bytes
SHA-256: 736288104d1dd9dc758bb7fd78e8321c03e3f076e7fc5da545f6e0e773d00434