Malicious PDF — malware analysis report

Static analysis result for SHA-256 681f17f52d1b5101…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 02:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6f0a3a3da1a5b505dfb96e2f82a54b6 SHA-1: a65f72d409ff943f37e397c5594cafed589de6cb SHA-256: 681f17f52d1b510187c5e55f8ea1203f62cf282ae8081a3be0a9fab81fb10452
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=honda+foreman+500+manual PDF link annotation
    • http://bbmeti.it/userfiles/files/gigili.pdfIn PDF document text
    • https://interconformity.ro/images/file/751296379.pdfIn PDF document text
    • https://dineflon.com//files/32552268410.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/garube.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/rusolo.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/96314983611.pdfIn PDF document text
    • http://sun-dr.com/uploads//files/202108122157101757.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/dikapatupifovu.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/lepixirotixelunoma.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd0c8c4869---bofudafawesor.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/46157241079.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08309115fe---tujofararapomu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608706721eac0---89655444473.pdfIn PDF document text
    • http://stromzeleny.cz/file/sebubuvi.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210521213054.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d7b60e025c---nunewabuj.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/b7e6568dc868b36b80fd88b8d528abee/53099612593.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/18801522900.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/98275901013.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16123bfedec8e6---56126852505.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-5/20210805195014908185.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/kogataxodegolotemi.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081178288da9---81087688013.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/leboresatefew.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/xusavusopixokalixixiludo.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_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 19392 bytes
SHA-256: dc9f7f9f37cc1ea69802dace2c041ba9a23e0719c94c8fb24da290ad6b6050fa
font_01_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 10504 bytes
SHA-256: 37ff5041b7b8dce697120843f567e9d0af4724cacdbf4210bbcc9afe828a0d4a
font_02_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1