Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c38ff31cd8d4ec9…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 00:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ba93f1d877d0fa03fda008f33d2bc7d SHA-1: 1691f5c91bb4ce2d37482c26d6e63b39bf678510 SHA-256: 9c38ff31cd8d4ec9a232376a32033651d20b4a43bad8f8af066bcc40ccad4838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

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 https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080163093db7---tanonelamijajetud.pdf In PDF document text
    • http://alarcon-v.com/editor_upload_image/file/jesufadabapelufugexug.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160db0e24b3780---legadegejoj.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/lapokoro.pdfIn PDF document text
    • https://dietacud.eu/upload/file/lixilulegetu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7939d52f07---bedefojodusejeloliw.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xemowilivivif.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16121a0edf1525---46706588902.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0389045a3---30764926332.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/57622587319.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/rufenilipanakuwuberidag.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/tolejoxorumad.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9985ae5d2---gidawafifasadagokuda.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d72ea3325bc---74713314548.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/mojep.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8ee73f0e9---rubudanelezufunobalojoz.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/zimakufokibaset.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160853236ec0c8---77377213279.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/009fa2ea519773b1c2e59f849b5e3f0d/14049191857.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca2a38026---tudujudewajotaperewav.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613683137649f---19705594183.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/5681322048.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1lj60e2n51q7ctfau8d0mo22n0/topubozapukirevamawus.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/18538723488.pdfIn PDF document text
    • http://ranch.pl/files/file/28902596331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mtap+reviewer+for+grade+3+with+answer+key+2018+pdfPDF 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_off0000bf5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 11756 bytes
SHA-256: 0851b5984954562b9f5f7efe8b32cd9851c2d9d61116d88e60aebd0a501a0a37
font_02_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 17860 bytes
SHA-256: 29938417ca4fa3f6b23d25b20835b7e858f2bf3d4585c18ccc70dd2c5e1d9870

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