Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b821fb76969ed3c…

MALICIOUS

PDF

88.4 KB Created: 2021-09-22 18:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4e239fbe79e19d6b8babbd906e6f5bf5 SHA-1: 3d6ffcf2b17813194d64f9108d89c842bb37a38c SHA-256: 1b821fb76969ed3ca147258d121466dfccdda19934ef74ca850b13f1f4c6916a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The primary function appears to be redirecting users to external, untrusted sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=siddhartha+an+indian+tale+pdf PDF link annotation
    • https://insolite.lu/img/userfiles/files/48707661513.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210918001103.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/nekuti.pdfIn PDF document text
    • http://profstil.az/userfiles/file/68941370602.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/dopozagenevukituruso.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/jemosipawew.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/c644872c9931c08f2b1ac277e538a337/54261478480.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147e81279f55---19071147510.pdfIn PDF document text
    • http://hnhappiness.com/d/files/wanofoxawixediberavepifu.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mesefusenisifi.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/55195516508.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/witapuwub.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1ajk8u5vto6l3em132ttjije2m/xizoratemi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef00356fc7---8024581129.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/35122363311.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/nozudujokisez.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/90334731985.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/wedivutamipiw.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/silugaxe.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/xexagowupuwipejonobosu.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/juwazukux.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3d27a200---60966578907.pdfIn PDF document text
    • http://gapp.fr/medias/files/talawar.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/86339690620.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/besuzoxexokav.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/datulatubitifefunumule.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_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 18388 bytes
SHA-256: cfde27de1502e49a41e9339e2a3588f5fdbf462cd47dbb33a9a323ee2057f09f
font_01_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 10384 bytes
SHA-256: 21730ac48cd50f6d555284d831fe5d80217b37be87c15a01793d793d7c037472
font_02_sfnt_off00013b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1