Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e75eb0241fe782…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 22:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a20c24ba6785300d309a3f7216a4268 SHA-1: 00f9f0eb3316f4134d113ab413d1d4feb9aaf235 SHA-256: c4e75eb0241fe782563dbd0a4102598dc37fb7de0f575b924d23afa0cd877fd5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://terrebleue.org/userfiles/file/fenowesofuzuwigolufa.pdf In PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/96117917031.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/pagede.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed9ebdd018e569ce82f4e95f9e4374bf/61649620550.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4481deab6---towefalo.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/lukoxaravezas.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/932f6b5cfe08784289c7487d96a2809e/19866002515.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/17893833516f2d44abd90c4f5cdcc2a0/16365987482.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1628068515554894325.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836d14784b---94369798911.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/6167f352aae9c94608e7b3ba04e67ca9/rurirufivakutijuzaxoliva.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/zozula.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/85545427980.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e9a6d8f7a55f883c4276cc73ebe8bb28/tibegu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/669787eb842f4b41d28354b2759922f3/29303269090.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/rozenopotugukelagoradi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/13df631daf7293d27a459c857cb577f2/77737234868.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e12dd00ee7b5adf17ea3fa7c76517c16/14172180516.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/kuzawinepedavedufurewex.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/88d4ef8bf23628da5cb7c5f9ee2584da/29991449645.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/bigovosusexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=log+on+as+local+system+accountPDF 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_off0000c72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 16436 bytes
SHA-256: 559a083517b3fa0862c8d32e982f8de78f5c4dc0448158a39c7cee3899ca9ed1
font_02_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 10552 bytes
SHA-256: 7b857ba05efa260bab2072d378ea1e69d79021bc1967f68776689660b2a1d639

Open this report in the interactive analyzer, or submit your own file for analysis.