Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d31bf84318bdfe…

MALICIOUS

PDF

89.9 KB Created: 2021-07-31 03:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: be8ba7885ed2423b68b42270c2b3a0a5 SHA-1: e1004b64bb4c1dc05fe675f1c808d35284683978 SHA-256: 78d31bf84318bdfe4f46a5478378dd3cae0b0546eb381f4ab860b978bcf8531a
164 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. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://clickkedai.com/userfiles/file/pumebiraziva.pdf In PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8460bb12a838ecfcc7371c203b158721/nugerofopilebovatuseravoj.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/5a50a9fbaa252bb522ced862e19f8d36/suputijisaze.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qrq0cjec0hb1ld3vp6rm6c2ta7/gewipavo.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/18772648778.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/nuxuwegaduwedum.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/fdfb47f910d6b0173c70f4c8f59caad1/gezibo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac412997ef9---begudekinefibafosevoxol.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/92848136992.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/36548482432.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/11971062758.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210730_AD7111AA97F6AFAD.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/zowufixap.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608844d068619---kizitoladoji.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29baa91461---2632509280.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/gubimageginokufafi.pdfIn PDF document text
    • http://carszana.com/image/upload/File/vipelutuloxosexofasazitik.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/55008111690.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/livadojadizaf.pdfIn PDF document text
    • https://tepihtrava.rs//files/16025990227.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/wejul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gravity+movie+in+hindi+download+480p+khatrimazaPDF 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_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 16816 bytes
SHA-256: a1c5a4e878edee3a8b107cf384c9af0c043a53f8a56c639116b6dba78d8c1f4a
font_02_sfnt_off00013e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E47 11352 bytes
SHA-256: 104e0dbe3e3bb1cc801b7265f9259cde3ecfb0fa964d0846c27c7e11519f6c45

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