Malicious PDF — malware analysis report

Static analysis result for SHA-256 c988db23b936497c…

MALICIOUS

PDF

89.6 KB Created: 2021-07-30 20:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ce7ceafa59eecbca33acc18a07b8e5c SHA-1: b6ab549cdc5cd1ce4531439a247e18a3517d3ea6 SHA-256: c988db23b936497ce74c99a9c26ad653a56d73cf43a4fc620651e39149de9d46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/d743vd0bogl532asssi270p8ii/nugeriwok.pdf
    • http://mientrungpetrohotel.com/users/files/50402964504.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48789a6d4---goresati.pdf
    • http://donghozibistore.com/luutru/files/tanon.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/2398158940.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/c9b499nm0frg34hmkol79ki558813tgt/41702151439.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cbda3daed---74835062659.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/vopivo.pdf
    • https://soudurelauziere.com/upload/editor/file/malixufisuporazimegodo.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/42964095914.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3818f52d6552558543b1f848c3021dbe/37717826816.pdf
    • http://virus-safe-zone.com/ckupload/files/65420956322.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f214db11f5---jogevifar.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66c5e9740---gizejegegonoviwowaj.pdf
    • http://asfalon.com/__files/file/visefibatejozuvasananu.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/nnko0kklvhnl9iu3lclfl14g40/67105864639.pdf
    • http://novelinternationalschool.com/ckfinder/userfiles/files/rorixo.pdf
    • http://agapetown.net/ckfinder/userfiles/files/sinodazipapukeled.pdf
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/dulovu.pdf
    • https://actaviaserica.org/board/file/files/dujepatunojemon.pdf
    • http://aarogyamedico.com/userfiles/file/759748837.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3aa2a9fd9d4152d24c8721e6050ff569/gijifudul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=qual+a+raiz+quadrada+de+28900
    • 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_off0000ef4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16792 bytes
font_01_sfnt_off00010761.bin
406104040239d789afa9df79358a9b702724506a377ce887c38720d48805e9be
pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 21304 bytes
font_02_sfnt_off00013dbf.bin
75722410b8afb01677ddab1343eeb35710c168aa5d83815c0f06dbce9acd8d77
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBF 10736 bytes