Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd6d862b1dc77f6…

MALICIOUS

PDF

92.9 KB Created: 2021-09-13 22:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc493a86618d3ae62986b4195bdbcbb2 SHA-1: c8d33067b337abad6e4778bd83e7159db576b1b5 SHA-256: ebd6d862b1dc77f691c7be2281d25b83a51de1391169d3b7e3b4c1228b764dd9
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The document body is heavily obfuscated and unreadable, providing no further clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://wastran.ru/uplcv?utm_term=gameloop+pubg+mobile+hack PDF link annotation
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1b6abf52---degisepibi.pdfIn PDF document text
    • https://fptica.ru/images/file/gunevexur.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/zekumebena.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/fewaxamufetukani.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/xifafutojetap.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/30628290010.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/xikufupituwejegawutal.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_AED3A275FFFF73BF.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/94658037094.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/69848886641.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/lexokoxetiwemakuf.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/zoweko.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e6a0da96b6c324e8daf407cdb182e5a0/renotinakiponine.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161374619ca341---falafevafo.pdfIn PDF document text
    • http://net-marketing.hu/images/files/pelem.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/75314619054.pdfIn PDF document text
    • http://saktigroup.in/uploads/tizofalu.pdfIn PDF document text
    • https://fptica.ru/images/file/74355125377.pdfIn PDF document text
    • https://signika.pl/Upload/file/70664223536.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f721208a---77413538961.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/73674239989.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/xuzamonimawojejuxo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370739dcb44---tikisoxinosofaj.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109060305326942.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86d78d027---xakezunibedinadelorurofo.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/70510657010.pdfIn PDF document text
    • 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_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 19808 bytes
SHA-256: 51fed42de5dd05b2e2251255654b98a611a53cdf42be7fb35393072dbd8920cf
font_02_sfnt_off00014d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D79 10724 bytes
SHA-256: 05eaa8dd657d9717fc06773e60b3e214a1b010172e0e4ac672d40c4f1a57f25f

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