Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31dfee475d1a39c…

MALICIOUS

PDF

80.7 KB Created: 2021-08-16 12:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98edf8f349c96155c74ffad4c76f15a1 SHA-1: 03dc55b00e5ca262c477c7d81f69117114219c72 SHA-256: d31dfee475d1a39cc0b262efd6a13156b0023fb08e5d0de29b64248d9a45324b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites or disposable hosting. This suggests the document is designed to lure users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=american+harvest+snackmaster+dehydrator+2400+recipes PDF link annotation
    • http://dush-kz.ru/uploads/fck/file/miforatelutewawom.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/90f3fb52f5ab5de694568f916df0da6b/6013570001.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/44217253203.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/ruvanudejitedenug.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57cff1b96---77199615103.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/zejenovefaravuluxetexo.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38465121228.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nj6tq98k81kh77ck7604galg41/4326458910.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/fexizukemadoli.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743eb7c970f---dixogapumasabawa.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddec85cac52---41683232843.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/dabuxufoduwumewijaliz.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa712595fb---97551667765.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/bosixuketefopemedub.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0q4p6q3qqaut46ao7s0pnfcor2/loxuto.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/82544306280.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/kerowejopurufu.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/55229412595.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/romafe.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/871fbb76ca92c7b2080fb7b628b015b8/sepuvef.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6ogidcatei3c71nbqonul923t6/tatuwewuvumuxasufi.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/pg7mo7901hmbiqgsam72d3c887/xugivilade.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/nazubiposetibif.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/pekofowukinef.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_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 11308 bytes
SHA-256: d00c0dbd10086ea76ea1cec215959c6a8d73c1f3d0008f2aafa46418ba8eeef7
font_01_sfnt_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 16656 bytes
SHA-256: 016b9f9ad642e58401be0c01f6d1c4b41fb8e19108849c04e6f0b26dcef42317
font_02_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1