Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb6bdffe0bdc312…

MALICIOUS

PDF

93.6 KB Created: 2021-08-23 06:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e20f80e6ffe1d05b61a6f2325b39b1d5 SHA-1: c30e6ec5ed402a9f2087b9a0c39124524513ce6f SHA-256: ddb6bdffe0bdc31247bbf707fc9bce3f1cdb5366a67e2fad82bf576d3bb5d39d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://synerhu.ru/uplcv?utm_term=night+chapter+1+questions+and+answers+quizlet
    • https://anmoul.com/userfiles/file/7740543781.pdf
    • http://thuexe7cho.vn/upload/files/29361470274.pdf
    • http://martom24.pl/martom/userfiles/file/dugafinotokafafujixe.pdf
    • http://cnzgks.com/userfiles/file///zavesidelemobokula.pdf
    • http://healthywithhart.com/res/file/faguz.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/xorojivebogu.pdf
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/56901619235.pdf
    • http://4grd.com/cmsimages/file/dugaxexokumirepolul.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/pnffshc04mj18h0o0hojibnfbs/memavepuguze.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a2afb613383ba6d051a65a09091e3c79/3267758487.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afc43bb3a8b---rovoxamemowufoxedolezivu.pdf
    • https://ap-qatar.com/userfiles/files/nuvidimane.pdf
    • https://etimes.mn/uploads/files/pijifidizuron.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/rixowegekewinejosi.pdf
    • http://rheinmotel.com/userfiles/file/72536540799.pdf
    • http://haai.org/upload/file/fejigakexazetoz.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a642c641.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/2bc1908a5bc2eda972609216ec8f9e20/vudusuref.pdf
    • http://mpti.ru/userfiles/file/22525731706.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa72b58952---52606460969.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe57e8df7---midemadoxur.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fimelejominimufexu.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/rilinowikolav.pdf
    • http://suaups.net/userfiles/file/gezidul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010873.bin
4c4cda051798d1143261b87259a5c49d1de4b53c6eea680acb634b88338a086c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 17892 bytes
font_01_sfnt_off000136f5.bin
22b0c2d127de7f9543d686569293d4c58ea5c1271073a1010992bb6a147faed9
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F5 11216 bytes
font_02_sfnt_off000150d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x150D5 16792 bytes