Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4de6445d55cd31c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 22:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e441395af2a73ac4865bbf100a70c28a SHA-1: a2982db5fab080ba2db2d0571310d6c0569c216b SHA-256: a4de6445d55cd31c658beb1659a9731adb0ccfc0a093774de6263c64c7a97b2c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or compromised sites, suggesting a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document may also be designed to trick users into calling a fraudulent support number. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • 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.
  • 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://huntic.ru/uplcv?utm_term=thermo+scientific+tsx+freezer+manual PDF link annotation
    • http://www.celso.org/download/favorumunelobufitumijuz.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/63d57febd04438a63e32e2290e8f5f0d/79966862349.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/8837821399.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/11162779630.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/4445851365.pdfIn PDF document text
    • https://webmenuplus.com/images/file/3192791217.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///wuwibari.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/zodokudulurejebuzonowom.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/35485725318.pdfIn PDF document text
    • https://areicon.com/images/file/forozosepefo.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/7365969073.pdfIn PDF document text
    • http://uteambio.com/upload/files/tamagurixojuzowokilu.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/modimifasimu.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/9f162983df1dd2e25d2ebaa1f7c066a2/87573909939.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210722/file/16269366483667.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d14aadf043b7d6a8e988e3ca453b491c/24622861246.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b64eff88a7e---nibunet.pdfIn PDF document text
    • http://canvangdientu.com/images/file/26710473947.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/mekiralulexolo.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/39195359418.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37de6be9d4---vafezizaw.pdfIn PDF document text
    • 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_off0000caae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 16596 bytes
SHA-256: 4c73477d508d1a22ebf98efa40c469b3aaed1ba981067e2537fa3e9bb1bbd168
font_02_sfnt_off00010d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D99 10824 bytes
SHA-256: 4360a3648c07affd87226dc6de271145c78c7b8e2d56a2e9337b256165c2f2f4

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