Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8e48cc54067ae6…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 22:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8cf579cfad072e8d96dd429209aaa68c SHA-1: bbc959a562fd4ba3247de0c296a2cf9bf5ca7195 SHA-256: 7a8e48cc54067ae6bdc0bb099d4278a179e914ec8998e96e5310c4c50191186d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://ideylia.fr/uploads/file/sazenuleladugabalo.pdf In PDF document text
    • https://dbjadow.pl/attachments/file/rujunidifuxawigivozederu.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/dafafarewekojijegogavi.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/87740716746.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/52114719937.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/pabopurategapupofosa.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tujuvakotuzofavip.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161378f042c36a---gogoroxugulitaxerixu.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/rudarisobowumef.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/33513814134.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237dae0f22---ponofowuwaxobumo.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/josokegetanuto.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/44620250194.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/vawelezekiwe.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/4433004277.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/85707143080.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/xanigodivalaguref.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/47348600644.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907120809.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/90335191085.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kusodogeminosovatisan.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613907839d85a---lujaxatilenosuna.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed410f522---zogodi.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/tidokasa.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/jopiku.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/karadenesaluzaresigaxego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=keyword+density+checker+freePDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 10648 bytes
SHA-256: ec7948a74f541b237b779e871ad3d316fa0d373a5528a6f4caa0d5ed22a1b3b3
font_01_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 17376 bytes
SHA-256: 47a0861545074d1ff4fa197fda0375a6087bdcf4127a9d75fe7c7daddd8ff206
font_02_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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