Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd3adb12786a487…

MALICIOUS

PDF

73.2 KB Created: 2021-09-11 16:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82a45a0b7308cb97848bc6cc2d72f3ff SHA-1: dbefc1c17187126e2e95f9af890454bdf0423757 SHA-256: 5bd3adb12786a4872d338361c106e243ff7ab1b08463376e7a932b09238b77da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites. The primary purpose appears to be directing users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.niceresidence.net/image/upload/File/85337629231.pdf In PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/433a984a2697b18575aa3f034ad61c85/31391099764.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96707edcf---sudewulevilajagabimajog.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/1506530697.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/tovarobelojozu.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/44017124921.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/xanemizuzoxapurukolejigus.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d065a394e---91043786276.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/neruparal.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/kagonutuvuzawe.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613151604c8d0---bolovigudomoxarinawid.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/37191770809.pdfIn PDF document text
    • https://dcimx.com/files/46624444214.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/84177522391.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/53839490787.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/tewugeve.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/murufijev.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161347e659a74c---jonufaxugusetelafomevexak.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/17228749710.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/25457034598.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/nogezil.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/706699f7e5beccb06006e45fa56a7c22/xabemodonuseviw.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/71943148180.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcf09aeba---48755120381.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/zuxovan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=after+full+movie+1234moviesPDF 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_off0000bd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 16348 bytes
SHA-256: 45953e9172faf2afcb2a28473bb876266f279677752aecffc06f1917c6d40a29
font_02_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 10680 bytes
SHA-256: c52c4c454386a23657e676ee985a879ccdf5864adc4882e5e26e2cca5b03c0e4

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