Malicious PDF — malware analysis report

Static analysis result for SHA-256 e381cb643381210e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-20 02:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f20907127b4ebe9022b1f5634b3f811c SHA-1: 144285322188d17285ec572c05745cc007f3620f SHA-256: e381cb643381210e52ccb6b722daa1fcf80973f3efa95222e85da79310bc6621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://cructi.ru/uplcv?utm_term=amazon+app+store+apk+for+android PDF link annotation
    • http://thuocamakong.net/userfiles/image/file/5262357064.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161391a1a5fd94---63229657993.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/lavanunibevomanuk.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/13958233211.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/zeboronopowapewesusuk.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/sivabukikagureretu.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/64863053937.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-04/images/files/53982228646.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/77342124752.pdfIn PDF document text
    • http://jar-ted.pl/file/bufalivazenosovaborefu.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/17094971014.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/44626116684.pdfIn PDF document text
    • http://vo23.ru/upload/file/bolusulibitakok.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/78079539667.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/pomuwojukeweduvurag.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5d22c40be---figotexisox.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/cd7c2c8a9f4399e881fd1bfe3e36f161/69047182889.pdfIn PDF document text
    • http://tion.hu/upload/file/57006958862.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/xomofesamuveda.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/36357636805.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zelax.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/vazivevegu.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/fevig.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/c0bca28046596b4d59c0155991a1f6e4/95094550696.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/lolumepodetujawigaf.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/tafitepapelet.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_off0000b64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64F 14904 bytes
SHA-256: bc515c5ca6a7e070b874ffcb8cef4e65e723031bd8ef455d2a5e128649575432
font_01_sfnt_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 10744 bytes
SHA-256: fbe020aef30c4ea4e352d929b40713fb5aa59b3841cb3944dfe608cb31f16658
font_02_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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