Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec554519e3bb8847…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 01:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0e5ed86391a6ab0238648c02edd72965 SHA-1: 60193ec53ec2fa9f6dd1b05da5bfe945640098d0 SHA-256: ec554519e3bb88470daed99ef87acd4d010d3e7cead9b42c7dea4472891efe30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/8f5gckfnetvm5cflet19r71pi3/93082148613.pdf In PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/29103088128.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/88830983958.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b9472eb1c27e53ce95be3e350d05c5dc/99817380119.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e6hgom54pm1hk9o1cajve5br2/64441582415.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5esmoeovfjcu0pt6kgrqkvejf3/lununage.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/jatajuwemerojakepopil.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/mobugirakenapowagenowana.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bc4bc8a17---65697438104.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/7f2973f7d295d1170beb6afea4b5be1a/2911270380.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/31893958552.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4c9a2ed2510478f7b79533829320c078/furusukotaladakitovuz.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/11349344999.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c44b8391e14---joninemilivipebutivuda.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b204007192---5977052925.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/xokefijanikinofemusag.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5c803579667e5f4379fa9bb09da7171f/fetozesafegegow.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d63b1d9f62b939970cca216c92836d3a/59247382599.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/987b8ac694aa7ca73711d7b577d68ea1/jawekilu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ad670e847197353ee2d58197e26b9768/70897997207.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/46970087113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mainframe+learning+pdfPDF 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_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 10448 bytes
SHA-256: c23694703612d8050d34d554f55ed2a868238e8448cc96b0f59a30ecbe440229
font_02_sfnt_off00011fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 18556 bytes
SHA-256: 131174951afc7c02d5262f8cffad88c9983c17e9b5eb2a21e8190457e203a957

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