Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a76d8dee7531c8…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 05:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1792a4f29b04f39b52555887e62a1e7e SHA-1: ea8a01b7478754d55b0d0455fcd1186b2306e198 SHA-256: a7a76d8dee7531c81ebd97af6a1ccabfd0462cc60fe6e04b9563c6d0e1bfbc02
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Heuristics indicate these links are non-clustered and hosted on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=coran+bilingue+pdf PDF link annotation
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/4604166405.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/gogatojo.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/vujudagobejojevedijoxobo.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/lofaweselesamowevurolew.pdfIn PDF document text
    • https://carlojans.com/cms/file/jojaj.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/aefc0d64fd4e9353825dc886127cb167/xibidofisujojotijos.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/difasekigexuzi.pdfIn PDF document text
    • http://unseretochter.com/images/file/karelubin.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/48344980121.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021070620210973499.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ru4q70s557nbjmh3a1hhm35511/ripiworuparewov.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e903670a---80943909376.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d8e9e1237394c897b5f025d56a568a87/kawelesisenubejokoka.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/ralujipapo.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/puzigavipakigolezurixom.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/99382649590.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/jinumafe.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/mudugazinugutewedapabo.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210516100536.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/nogumifejukefegefodorele.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6vs4df84t9i8c0katc8aipdds6/3029507826.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/176459600060b1baa77ef5c.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d92feafec---sisumeviwilolekevaxinis.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/poselenivolonubekan.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_off0000bb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8B 10680 bytes
SHA-256: 3208aec7e68078ef1dd4593d497954547b15a26c3c9e9e90e26b6828eaee6d40
font_01_sfnt_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 18112 bytes
SHA-256: 7b3655d512d4474774ebbb684cad214b1b1e0d3d6e8b2752d375e464aac6f3f2
font_02_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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