Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc7429018e4cfd2…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 08:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eaafa48b1e8cdc9cd3be150a1bb9338e SHA-1: cba02174b940c239d762e650876df2d895a4a785 SHA-256: 2bc7429018e4cfd2ccaa87a27b472f7b0b61784f108ea4818751b4f63cee3322
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or deliver malicious content. The presence of heuristics indicating a "Security Software Disable Instruction" and "Callback Phishing Phone Lure" strongly suggests an attempt to trick the user into compromising their system or engaging with a scam. The numerous links to external PDFs, many hosted on potentially compromised or disposable domains, further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sapporomn.com/userfiles/files/52426124798.pdf In PDF document text
    • http://verzorgingsindex.nl/images/uploads/92514477078.pdfIn PDF document text
    • http://tid.vn/upload/files/85956746891.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/49778974179.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161424dc8a2b18---96703919977.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/topexemuvoxozoxexorul.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/wutipe.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/lumirijomirilezawibakox.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0477c87fc---90657456597.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/vefeb.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/17391199458.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f608076c---89415135050.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/dosugetivonozapejevagu.pdfIn PDF document text
    • http://glassick.com/userfiles/file/nutirepetupel.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/93093680821.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ee429028d---dobaseboxopotiper.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210909215812.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8319d283---58801143865.pdfIn PDF document text
    • http://hk-keber.de/images/file/47351983015.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/84285302490.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/kikumomuvokibazirifafute.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f594774234a1db0ca2f5127497e5647c/83966577376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fnaf+4+free+no+downloadPDF 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_off0000cc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC30 10128 bytes
SHA-256: 3ebfc0b06976c8ef6971fd7c5418fc1b652cf20593a05889b373221b1dde3216
font_01_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 18056 bytes
SHA-256: b253f5b4f44bf9e5b219d3d68a5562e97eecf8523aee98c74ea4e1578052ceca
font_02_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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