Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bdf1df42e20fc8…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 15:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a11587bb7c249a8c99a3564e9ee693d SHA-1: 994d12a65935761add5ade995f484e8084017827 SHA-256: b8bdf1df42e20fc84a8ec8a798ee11660ae2461427dc97e812793805e29beabc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of URLs, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vigova.com/Images_upload/files/89372363404.pdf In PDF document text
    • http://vdi.vn/userfiles/file/15680541006.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/5339488257.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091521040373499.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/42054556278.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/56263847539.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/96817560819.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144dbdaee3cc---kinedazazirovoteduxuxade.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/fokasuboba.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614014d94dbb0---koduxodomapizegaxuxujixej.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/pamezukuw.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/movawonol.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/36510942497.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/68022472830.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/00ec94f198403b15a1285b12646911cb/45176328496.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/gepevawunirabewenagoxuxeb.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/16520662844.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/53715577068.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/5419301127.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/sokuwotejivulezogob.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/runuvoxuwiluk.pdfIn PDF document text
    • http://leton.pl/userfiles/file/lavisoditi.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/nibilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=video+hd+player+androidPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC214 17228 bytes
SHA-256: 135abaa14c4670bcb4440deda2519fd4904d02da47bc66b66c127f72889966f9
font_01_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 10308 bytes
SHA-256: e3b3c5641a6d4191ae6aa371662b5c3a119dd1a898698a71dd77301e64a32460
font_02_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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