Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a63f94d641e44c7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 23:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 093001aa4f9994572c56f740cbc224fa SHA-1: d05bf69d64608950d1658b102fa4b236baab6a75 SHA-256: 4a63f94d641e44c73a1ccf7f13948c97358fe5a18f034a365f692ca3f6aeb6c8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content to infer a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=neurosis+and+psychosis+freud+pdf PDF link annotation
    • https://infoenergie-loire.org/userfiles/file/60213650333.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/18875074262.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/vp6rg3q814fd5cov22imkuobob/53407644720.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/fae76024d1e8dc1b100c196348c74d98/84336180994.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/17191047370.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/39087204779.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/fudobuxekevukoze.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/18571cd9a25a4f49c085694c99b22d00/97508292791.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a894bc0855f---5152251405.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1dfd54a4a---murolepitaxofu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2b1a298a998321aa513c45fc7f5efed1/12066644039.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/wujilezobumetonoso.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/gotitemiditukunipotafovu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091635f1421c---bibugo.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/dexebuvasazififaxe.pdfIn PDF document text
    • http://3asoft.vn/img/files/43565880674.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e28b7a95---14816954354.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20d685043---51268460134.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/28734689722.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0475875001620801405.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/sedoremaxukove.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/baritazume.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe76d348bd8---5808138153.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/66952730066.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_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 19772 bytes
SHA-256: 6e03646e3a093f07e157a5b295a2579b3a9632b9a5f9764a64a6b05e3365161a
font_01_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 10764 bytes
SHA-256: e40beeed89bad7a5febdb1c6121ee56d870b9c04b11da30b026633a52b26c464
font_02_sfnt_off00012ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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