Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7d829e184a6311…

MALICIOUS

PDF

106.2 KB Created: 2021-07-23 11:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e60b30b73fd670a7d68993e45618e83e SHA-1: 5337887eeb9ae0783bca7eff69224e81f2d4b380 SHA-256: 3d7d829e184a6311d120b57b7a2de39ac71d2f68a511ff8b8d47bb4bdbec5e63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://slezanie.eu/userfiles/file/78739067255.pdf In PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96a7e945b---16634402747.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051205231954.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fgt5rop2bg45vr1m3roe9e9lu5/67176952532.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160904fb2b737c---46978494782.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/6604147522.pdfIn PDF document text
    • http://sowitech.vn/upload/files/67510290059.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a7f23dc76d77dbff632e63242c146ce1/nopomugiwowu.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3162aee742---vagozoxiwotodiv.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210719/1604146553.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jonvnfbp47l4au4r1d955vd432/1189545309.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/at3fe1nqsq3qjonip7i5ko7k1c/69325476870.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/38067550997.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e0l5mcjk2qrblnlpdp32hc6nf9/36998113810.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094926504b78---52861783613.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/75002471009.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/phjc6fkguph0pa4fpeubr5vjup/refoditaxe.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xezawimofaruzebififemoro.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/27089963411.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd7c10459c---16544506175.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/89561042023.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/kamada.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ad1866483---jedoxonegupugeja.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d326b4e9b---kugofurigumaxabinuguz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=multicast+source+discovery+protocolPDF 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_off00013a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001528b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528B 10676 bytes
SHA-256: 1a1e5cb8c5efe243cd41947247e55e3f806032a72c87f866d4ddb81b822105f7
font_02_sfnt_off00016b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B35 17776 bytes
SHA-256: 9ad35e9daca6cedb721360b25c0060f11241495b0b1a223a182343b4414e2531