Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ce4a63800a7c5c…

MALICIOUS

PDF

132.8 KB Created: 2021-07-22 12:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9d35d4d652732032ab47b9478e8fcc2f SHA-1: 5c66f23eb0b00305d657fdf6bc3db62f63611537 SHA-256: d2ce4a63800a7c5caae43eeab55994aebe3c69bbf8c460ffd9adf7bd3d1be320
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abaafca9578---tonedubawosorokexipinum.pdf In PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/18151939022.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608312fe136ba---18148132700.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sma2rdd5lijpl69aqtq2ovg2tn/leder.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdecd6f714---baxipipasoxekuwuluval.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bc95eec17696038fe1440773ef60484a/71156844410.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/duvexewi.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/zarurit.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/5167905699.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sijatujamapiredevibug.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608f51ff63eb0---tigudogejofo.pdfIn PDF document text
    • http://svx.su/ffile/file/87777947822.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d77bddc42f---50228380690.pdfIn PDF document text
    • http://vodnik48.ru/content/file/poromutigixabixi.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f12f15e93---junogubozozemizuxinata.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/32515433757.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3056868f31---folafunuvitapoworifu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/60e1057d8d7abe3461c9a5ce7484594a/10324076652.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160751878bf265---bafem.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e3r1rpre0u92k8tgtjvc687vi7/legenamerasagot.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/mazuninetigexadoda.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08fb926aa---womikaxovoboded.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/39191920879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=jeffery+deaver+the+bodies+left+behindPDF 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_off00019e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E91 22192 bytes
SHA-256: e5f3b7c651674a824282d6e79f1dbd10f725984687bc61d7e5385341a5cbac5e
font_01_sfnt_off0001d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D37A 10764 bytes
SHA-256: db9bfc5a7247fbe3cb5571538d067cabe6991a61ebe2a1b199a918bb1bcc1762
font_02_sfnt_off0001ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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