Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d9bc5eb7f26b34…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 20:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb85b5bcbdc488fae13d99e09e3ccd92 SHA-1: cf8bbaffb6cb9d599548bedfda5d334ef7b12ca3 SHA-256: 21d9bc5eb7f26b34bcd73c5877e9f765a701e8b3b66c3d7963d510415682c5d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://kingdomofgodmn.org/userfiles/files/jukevogokifuwigijinaguti.pdf In PDF document text
    • http://phuketdriveschool.com/userfiles/file/16790693711.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/genitafojaraz.pdfIn PDF document text
    • http://standardamulet.com/files/files/55922253847.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/dosaduxumabujorigag.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/69041919153.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16029370369.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/gikenamopogatarevaxada.pdfIn PDF document text
    • http://erex.hu/upload/file/toxanosaja.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/29290726047.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/78309993201.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/41731895244.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083a30d5710d---nidubeju.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/70376150555.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/53978292513.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608920c77032a---6540289399.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/dawifogad.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3951aa6c7---dutevevidobal.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/27522412434.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a2fd149ce---zorumipirenegamemuzator.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/73537523758.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcedde63f6---rijujururaf.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rm8v4jmaip11a6380rvceij274/xoperepifafejikuwup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=copy+to+usb+with+rufusPDF 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_off0000e525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 10480 bytes
SHA-256: ae1b68802b6ae414e6549150d0b49f2a736f65db8fefd5837bf9f79312742991
font_02_sfnt_off00011505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 17280 bytes
SHA-256: 4fa81761e91ebbd72bf18147efc2db1bf7188c5e516e6fd9ccf815c8042b5a8d

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