Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3e6e9efe662df3…

MALICIOUS

PDF

78.7 KB Created: 2021-10-05 23:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1503d90ab1fb84f8183fa4e9c8d310fd SHA-1: 21dd2dd3c6088200de5b3c5e59b51b9a394b48c9 SHA-256: fc3e6e9efe662df331c1cd4e6cd889182f4b9369b987c34dba1dd620f5f51a74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm on disposable hosting and compromised CMS upload storage further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://congress.bpv.su/content/files/files/51794698851.pdf In PDF document text
    • http://chinalabware.ru/d/files/77145322038.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f16215f01---xunufifotovif.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/wemomamegifebidimujuk.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130241b250b2---wigakuzo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b88423f0c8---11258324123.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/jokatobabunesefenapaxedup.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/nifoliboxubojavudomexij.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/wuxoziwopaxararawe.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/musuzunedojozumobuwiro.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20211001005031.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/96129152913.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/tifusefusumidiwoniwekolex.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11868a6bf1d0728485f63455c2628a6f/39246451432.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/rofupipepojaso.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c792a5ff37---22353816419.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/wefililoba.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/pedirimeneriwulefunagabox.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/tewilelawez.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/89106837015.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/rasozejezaga.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/tixupokomig.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/4464809799.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/goxonofukalowiwadizowe.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/poliwumefekugijaminomab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=basketball+jersey+in+spanishPDF 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_off0000ca30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 10756 bytes
SHA-256: a83eff643ce2969015ba1d0cc2c4b68c0bafabb688dd0cbea4b03857ca0a8f25
font_01_sfnt_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 19492 bytes
SHA-256: 2267cbaf2b694e8eb0684e7c52ed20ac508e8c4694e33a23063ee601e95aa8de

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