Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1fb650c6ed60ac…

MALICIOUS

PDF

91.9 KB Created: 2021-08-04 22:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1871f8cff538351a33a78bafe1e0f995 SHA-1: b93e88974fd103c497f0bb65bd58751cc3c3975a SHA-256: eb1fb650c6ed60acae3b8af320156f455bf19e871fa92fce8fd8ab4baf4b2e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary function seems to be redirecting users to external content, likely for phishing or to download further malicious payloads. No scripts were extracted, but the extensive use of external links suggests a delivery mechanism for other threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://wastran.ru/uplcv?utm_term=annexure+ii+%E2%80%93+format+for+certificate+for+aadhaar+enrolment%2F+update PDF link annotation
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160773d7ebee6f---26777272325.pdfIn PDF document text
    • https://digireg.it/upload/noxaxixamuzakozixudaw.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/26080627889.pdfIn PDF document text
    • http://atomleasing.ru/media/File/roxedidazatuwavuvoxaxede.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/dovenonizidarukak.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0d8e305d220efeaadbdeb6450d5e8a52/43025369875.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/vifewowudedutazope.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/39884303798.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b15de278---84391037531.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160749ea9b1717---78417285270.pdfIn PDF document text
    • http://geotersrl.it/file/22480042669.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4e3c7b010c7a9a6f85b47c122ecb0296/kivejejapu.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2106271847389541182u3ich.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072cfbea5227---wukuxawatamuxigigufe.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210504020556.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/95981270990.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/mosudukobirasoverun.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216161447293780.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d03b994907cbea154566edd5eb1fabbc/wesunugiwataxopefoja.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/polekireduvulizoge.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bc872e4ae---dapegadagerupefur.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/xadewepabamifanuxuru.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/49ee2ef8dbeef68fda6f42053e524bef/jenutal.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 16640 bytes
SHA-256: cececbc76f3111b3fba26178c8cafd6b348ff19151bbb5c12a34da56a40eeadb
font_01_sfnt_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 16172 bytes
SHA-256: 637a9dac0afc585f1f105c2de408df99420c2eea19216aca5c902ef31b2be0e3
font_02_sfnt_off00012c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0F 10964 bytes
SHA-256: c5542e776ab51f03be64f76a719818bdce3a977ed68d9459309dc8daec150996
font_03_sfnt_off0001456b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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