Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3eb47283262583…

MALICIOUS

PDF

102.9 KB Created: 2021-08-20 03:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97e26d2dd6a3f0183ed686c57f62239d SHA-1: 38351661f853c25143058878800d268654f61836 SHA-256: 5d3eb4728326258359f3f95bbf77f1833b034c9e546787239c9361493aeecd5f
176 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML classifier flags strongly suggests malicious intent, likely for phishing or malware distribution. The document body was unreadable, but the heuristic firings point to a callback lure or a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b674265a8---memebafunut.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/9849frph80q21r988gb12p3an5/talibex.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/dinewixatabos.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92e22d575---14903406907.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/77296421904.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/74196026909.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/wiwimegizuritola.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/69f5cb69ed5805de6e500e23acd2cef6/kanabomojasibigike.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728f0c2615e---jamorofikamigubudinaw.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/bawivokajoz.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/velefuvumivefuz.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e3f39120ffb14289d31930684a2ccb48/62035662046.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/43014013922.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9899d8427---68956160399.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210813131123.pdfIn PDF document text
    • http://watch62.ru/files/files/11585985674.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/tinil.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d663b586a---28475892171.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/vamuwe.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/480a383741d7e1bc8ebeaf3dc18e6db5/94831092880.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0p1d2kjb0n4mlddegut8mk7da7/bodujosewerawelirop.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3b8f05d5---xopulamodumuroxog.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/6583734107.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5da2d6c19f4e60b2586730710ec0775c/pedowulavevapitipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sunday+school+lessons+for+adults+pentecostalPDF 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_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 10916 bytes
SHA-256: def23c80a85f9f77c953ee5c7fa90fb918d539143fbe4024e54650227cb59bc3
font_01_sfnt_off0001459c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459C 18016 bytes
SHA-256: 42e0095ac326e0889e9969c1d088d1cb965c1dbdffb3e79072a7476302febf19
font_02_sfnt_off000174f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1